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You will most likely use her Dragon Master Line for both PVP and PVE. If you really don't have characters to deal with Thunder Dragon, she can go Duelist and help you kill Thunder Dragon.
For Duelist, you really just provide any SSR gear should be fine, it will be only used in Thunder Dragon really.
Weapon:
Ragnaork > Peacemaker
Armor:
Last Rite> other SSR armor
Headgear:
Kings Crown>Red Ribbon( Flower boon bonnet ) > other SSR headgear
Accessory:
Lone Star> Slayer Emblem >Overlord Badge
Breeze For S1, or Rough Sea for S1 or S2
Lightening Flash + Roar + Ride the wind.
Holy Pegasus in most case, Griffin Knight sometimes (deals more dmg 1st hit but overall less op), but Griffin could be better in PVE.
For thunder Dragon you can also try Masked maid.
Stay at the original spot turn 1. Depends on enemies' buff, and your own buff, find a right time to jump in, trade with enemy tank.
If you are attacking Landius, kill his 1st life then retreat back is always a good strategy.
2. Use when your enemy has no tank.
Clarret is top tier if your enemy has no tank. Just find the right timing to jump in, she can kill anyone you want.
3. Counter Zerida.
Just because of her high mobility, she can be used as a Zerida counter. Especially as P1 to counter P2 zerida.