your daughter is manipulating a situation, which we all do
she gets lots of attention when she cries about leaving mommy
if you are more matter of fact about it, she will be too
kids pick up on our emotions better than we think they do
validate that you know she will miss mommy and then redirect her attention to what fun things you both will be doing...don't plead...just say...keep is short and simple and then move on
the more time we spend hugging and kissing and reassuring them etc etc etc the more they will react
