FL- You may want to take weekly pictures of your mare just to keep track of her during this time. I did this with a little mare I got a few years ago and she didn't look like she was gaining weight. But, when I went back and looked, it was obvious that she was. Those weight tapes usually aren't accurate.
I would still have her mouth checked. Even if they were floated, she may have some other dental problem that is keeping her from eating.
I would still have her mouth checked. Even if they were floated, she may have some other dental problem that is keeping her from eating.