Dear Tina,
It's not uncommon for children to show some unsettled behavior toward the end of the school year. The anticipation of change can be an unsettling experience. Of course, I can't say if your daughter's reluctance is related to such anticipation or not. You are wise, in any case, to notice how well she seems to be responding while actually at school - this is the important issue.
It may be that your daughter is simply responding to the natural ebb and flow os some SI symptoms. Children with SI do not display a steady, unwavering response to their symptoms.