K.D.
My daughter went through the exact same thing. I am a teacher so when she went back to daycare after a summer off she was very whiny and clingy and had tantrums and tears nearly everyday after daycare. We found it helped her to have a "coming home" routine to help her settle from her long (but fun!) day with lots of stimulation and transition to home where it is less busy and she's tired from her day. We would walk out and get the mail when we got home, then go in the house, take of her coat and shoes, get a drink of water, then read a book or two. That really helped her because she knew what to expect when she got home, much like a bedtime routine at night. After the books sometimes she would play by herself and sometimes I would play with her, just depended on her mood and the day. But after we got the routine established she had a much easier time transitioning to being at home.