P.B.
What is expected of her at Day Care? If she is "good" all day at daycare then its possible she needs melting down time with the only person she can truly trust.
Until my daughter was old enough to understand the rules of running errands she stayed home with Daddy while I got things done. You deserve to get your work done with minimal resistance since you're working full-time too.
I like what the other mom said, stay strong you are the mom and she needs you to be in control. She needs a role model and a person to help her make sense out of this world. Sounds like she's got the perfect mommy!!!