Maybe there's a particular toy there that she wants or something? Or IF it's the fact that there's kids there to play with, perhaps you could compromise with her to set up a play date at a later time with one of the kids or something?
I was going to say that my dd2 has been reassured at time in having me draw her a picture of whomever/whatever it was she was upset about leaving, I'd hand it to her and say, "here now you have your own little mommy/daddy/big sis/park with you to bring everywhere!" And she'd be pleased as punch. You could take a photo of the daycare building or teachers or something and let her bring it home, if that's something you suspect might help. Or leave a photo of her there, and say 'little you gets to stay here now until you come back tomorrow.".
For us, the drawing seemed to be something dd could control, and I suspect why it helped for us. Also, a bit of a fun game which dd2 loves.
What about having something fun waiting in the car, like an exciting snack, or different toy, or even something like the iPad or iPhone if you're comfortable with that. Whatever might distract her to ease the transition a bit!
Momma to Sweet Rosie 7/06, Lost Baby J 1/09 at 12 weeks pregnant, Spitfire Ada born 4/21/10, and Baby Boy due July/August 2013!
Aspiring urban homesteader, photographer, homeschooling momma! Blog link in my profile.
Katie - Married to Mike 06/02/01, Mom to Sydney Anne born 11/21/09 and Alice Maeryn & Oliver Thomas born 04/24/13