Hi I am sorry to hear your daughter is having such a difficult time
Gall bladder polyps are rarely cancerous but the risk depends how big they are.
Some info here:
I have a 2mm cyst on my gall bladder which was found incidentally during an abdominal ultrasound that was mainly checking for intestinal inflammation. I saw it on the radiologist's report but apparently it was so irrelevant that my GI doc didn't even mention it, she just told me my results were all normal.