Leave her at one point and try to not move her unless you need to!
She can't cast while moving, just like you, so if you make her follow you even tho she is save from 80% of mechanics you loose a lot of potency. D:

ontopic:
  • always obey!
  • never use macros!
Only exception: changing eos/selenes skills when casting the fairy. That way you only need 3 buttons/keys for both.