High Concept:  Psychopomp Mambo
Psychopomp (from wikipedia):  Psychopomps , literally meaning the "guide of souls") are creatures, spirits, angels, or deities in many religions whose responsibility is to escort newly deceased souls to the afterlife. Their role is not to judge the deceased, but simply provide safe passage.
Mambo:  (from wikipedia):  Mambo is the term for a female (as opposed to the Houngan, or male) High Priest in the Vodou religion in Haiti. They are the highest form of clergy in the religion, whose responsibility it is to preserve the rituals and songs and maintain the relationship between the spirits and the community as a whole (though some of this is the responsibility of the whole community as well). They are entrusted with leading the service of all of the spirits of their lineage.
    Invoke: For working with the dead, spirits or the still-living bereft; for dealing with the voodoo community; for recognizing magic or occurences related to ghosts, the dead, voodoo or the loas
    Compel:  Delia is a Ghost Speaker and a priestess, she can be compelled to aid her community or deal with the restless dead as part of her duty and mantle of power
    Declare:  Delia can use her standing as a Mambo to make "divinations" about people to gain access to places she might not otherwise be able to go; she can be reasonably expected to know the major players in the voodoo community and those antagonistic to it.
Trouble:  Black Magic Woman
Opening the Gates of Guinee and rousing the Ghede loa is not a feat that would go unnoticed.
    Invoke:   Knowing about or recognizing black magic; Delia opened the Gates of Guinee and felt the cold, November wind and is not afraid of death or the dead; Delia can turn up the intimidation factor to scare people or force their hands. 
    Compel:  Lawbreaking is seductive and compelling; people wanting black magic performed might try to contract Delia, politely or otherwise; Delia might be on the short list of who to blame when something voodoo related goes wrong around town; Delia has a reputation as a Petro priestess, and while her congregation knows that she isn't a necromancer, those not as familiar with her might think she still practices black magic.
    Declare:  Delia can instinctively or through a practiced eye recognize necromancy or other necromancers at work.
Phase One:  That Voodoo That You Do (This might be too similar to the high concept and can probably be rolled into it)
    Invoke: Delia is recognized as a voodoo priestess, if not an up-and-coming voodoo queen; Delia is given offerings (food, clothing, etc.) by her congregation; Delia can use her standing in the community to comfort or intimidate
    Compel:  Those who don't believe in voodoo, or who believe that it is only superstition and not a true religion or invokation of power might dismiss Delia's power
    DeclareDelia can be assumed to have "potions" and voodoo dolls on her person to use for intimidation tactics; Delia can be assumed to recognize most of the lower class followers of voodoo and step in to help them if she sees them being harrassed.
Phase Two:  Veve on My Door
Veve:  A Veve or Vévé (also spelled beybey and vever) is a religious symbol commonly used in voodoo. It acts as a "beacon" for the loa (also spelled lwa) - a type of spirit, and will serve as a loa's representation during rituals.  

Every Loa has his or her own unique veve, although regional differences have led to different veves for the same loa in some cases. Sacrifices and offerings are usually placed upon them, with food and drink being most commonly used in the West.

A veve is usually drawn on the floor by strewing a powder-like substance, commonly cornmeal, wheat flour, bark, red brick powder, or gunpowder, though the material depends entirely upon the ritual. In Haitian Vodou, a mixture of cornmeal and wood ash is used.

    Invoke:  Delia is better at invoking Maman Brigitte or the Ghede loa; Delia's peristyle counts as holy ground and ritual workspace; the veve uses Delia's Lore instead of Resources for determining the strength of her ritual workspace.
    Compel:  Delia can be compelled to do Maman Brigitte's (and possibly all of the Ghede loas') bidding; the veve basically declares for anyone that knows what it is, that Delia is a practitioner and an Emissary of Maman Brigitte.
    Declare:  Delia has essentially hung her shingle on her door, announcing that she is open for practice; she has a yard full of voodoo ritual items and her congregation bring her animal sacrifices, food, clothing and other ritual components so that she is cared for.
Phase Three:  Ti Bon Ange
  1. ti-bon-ange (little good angel). This is similar to the conscience in the Western understanding of people.
  2. gros-bon-ange (big good angel). This is similar to the soul in Western theories of person, except the soul is much more separate from the person than is a western soul. For example, when the person goes before God for judgment it is the gros-bon-ange which presents "the person" to God and makes the person's case.
    Invoke: This works like Harry Dresden's Chivalry aspect but for little children (below high school age, though if they seem particularly helpless, she might help teenagers, too)
    Compel:    Delia can be compelled to aid children (or things that look like children) even when she knows it might not be the smartest thing to do.  Having lost her own child, she feels an obligation to help any and all that she can.
    Declare:  Delia can be assumed to be carrying sweets or small toys with her at all times
Phase Four:  True Love Down in Guinee
    Invoke: Gain benefits to resist WCV, specifically House Raith; immune (for the most part) to intimidation tactics that rely on hurting family
    Compel:  Tyree or any spirit that can fool Delia into thinking it's Tyree can compel her actions; Delia brought Tyree back once, she could do it again.
Phase Five:  Standing at the Crossroads
    Invoke: The Crossroads are in integral part of voodoo, and Delia is always adaptable to whatever direction she choses to set out upon or which she finds herself upon.
    Compel:  While she's adaptable, Delia doesn't have a lot of grounding, she lost a lot of loved ones and saw her city uprooted, so her resolve and her faith might be shaky; in situations not directly related to doing the Loa's bidding or dealing with her congregation, Delia can be indecisive and undertain.
    Declare:  Delia recognizes "crossroads:"  points of branching destiny;