She had two months of mommy's one on one attention and now she is just part of the group. I have one that just sits in the chair and waits to be picked up. His choice I gave up long ago. BUT... he comes to the table when we eat, he comes to the table when we do fine motor, he comes to the group - albeit a few feet back from circle when we do our lessons. Other than that freeplay is just that - they are free to play wherever.
It will take time and you might want to try the tough love version rather than trying to make it all better for her because that is a losing battle. Nothing you do is going to help only she can make herself happy. So physically take her to the table at mealtime and serve minute portions of all the foods and then walk away - do not talk to her, look at her or in any way engage her - all this does is causes a power struggle. If she sits there long enough she just might figure out she is hungry. In this case I would likely serve a cookie for dessert and give her one - less likely to refuse to eat. Once she gets the hang of doing stuff again she should come around.