My guess is her behavior is related to the move into her grandmother’s home—and to some possible anxiety about the future move into the new house. Moves are very disturbing to children, much more so than parents realize. If you are not working outside the home now, you may want to reconsider putting her in day care (even 2-3 days a week) just now. She is obviously in need of extra time and reassurance from you, so I would make every effort to gratify her on that score. If taking her out of school is not practical, or if you very much want her to be with other children, schedule an appointment with the director of the school she attends or with the lead teacher in her group. Perhaps the two of you can come up with a clue as to why she is so reluctant to go to school. And be sure to take her to see the new house frequently, talk about its progress, and help prepare her for the forthcoming “big” move.
Our parenting advice is given as suggestions only. We recommend you also consult your healthcare provider, and urge you to contact them immediately if your question is urgent or about a medical condition.