K.M.
I think it's best to realize (and it sounds like you're already trying) that it's really best for both of you (not to mention Dad) for some separation. It allows you some independence and it gives dad some time to try his own style with her. This is also helpful for dads to gain more confidence in their parenting abilities.
I received great advice to be happy when I leave him...and WOW...that was true. When I leave with a smile on my face, telling my son how much fun he'll have, he cries much less, or not at all. And, truly believe this...she WILL have fun in her new adventure. And, so will you!