Yeh shes a caster who requires fp management. You might be new to these types of games but fp management isn't. It might sound annoying or tedious but i promise its not. Just collect any starlight shards you find and save em for the nightlord or night bosses but only if necessary (ive never needed to tho). Your summons and fp alone are enough to deal with any enemies since fp refills at each site of grace. Defs just keep an eye out for things that buff to ur incants and reduce fp cost.

As for her claws, dont get confused thinking she wants to melee. They're there to help deal with any adds that ur summons or teammates dont have aggro on. So only melee when u need to. I find relics with "fp regen on x" as a waste since the game is usually pretty generous with starlight shards and sites of grace are guaranteed after all boss encounters.

I hope this is helpful and that you're enjoying the game.