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Her Forest Sage line is recommended. You get a 7 less Int, and less mdef, but gain advantage over demon. This is useful in both PVP and PVE.
Weapon:
Miracle wand > Queens' secpter > Red Moon > Blue Moon
Armor:
Tennyo's rode > Other SSR armor
Headgear:
Tennyo's Headdress > other SSR headgear
Accessory:
Special gear (Available at S3) > Vidar‘s Rose > Dimensional Jewel > Holy Ring
Clock for S1 and S2, Magic > Breeze > Full moon for S3
White Dragon's breath, Ice Missile/ Holy Missile, Tree Shield
Sorceress for S1, Sniper for S2 and S3 ( New Troop)
Always stay behind your tank to provide Tennyo's buff. Also, use tree shield to add def to your tanks, so that they can survive from Single target attackers like Clarett, Luna, Leon and Elwin. Spam AOE at the right timing. Her AOE damage is great, but she has trouble to continuously spam those AOE. Thus, you really need to be careful and use it at the right timing.
In S3, with 6 cost and her special gear, she becomes very very good. For S1 and S2, she is usable, but not the top choice.
She is not recommended in boss battles, but her AOE spam can make timeless trail easier.