Do you think she might respond well to some sort of count down till the daycare closes. Maybe phrase it differently...count down until a "Mommy and Me summer" Something fun like a big jar of jelly beans...she gets to eat one every night and can watch how the jar empties until the last day of daycare.
Not sure if it would help any...but could be fun and you can try to spin it so she realizes she only has a little time left for daycare so try to make the most of it.
Also maybe have her spends some of her daycare time planning the summer. Make lists of what she would like to do, places to go, games to play, crafts to do etc. Get her mind off how she isn't enjoying the daycare and thinking ahead to what she will enjoy.