I don't know how long she's been in daycare but she's also at the age where separation anxiety is more seen. She also may just be tired in the morning. I'm not saying she's not getting enough sleep, she just might want to sleep a little longer then she knows she's getting up to go to daycare and you aren't there. Is she this way on the weekend? if so, does it last as long as the week day? I really think kids know this hurts us more than them, my oldest and youngest didn't like daycare at all. My youngest only went for a couple of week and now he's at home with his daddy. My heart always hurts when they are crying, even my sister watched him, and he would cry for her. I know he was fine but it just tugs on your heart.
You are doing a great job and I wouldn't worry about it. It will pass some day, it may go on for a while. Just continue to be strong and just know she Loves her Mommy!