Caster Vive la france

Do you have an AOE caster? If not and she's your only one then yes. Unless you have a 3 turn farming party then...
Do you have crit servants and has only has as crit support? Then yes she's a tankier than Hans so yes.
Do you have a taunt CE and use the battle suit mystic code? Then yes us her third skill with the taunt and watch her blocking everything.

She works great as a crit support. I tried pairing her with my lancer Kiyohii and Hans with 2030 and it was great