I can't really add much to Jemma's post, just passing along hugs and prayers for your Mom's quick recovery.
is she has just had the bad luck to develop gall bladder problems, which can cause many of the symptoms your Mom is having. An underlying infection (UTI is a good call, as it can often "fly under the radar", causing general
abdominal pain and a feeling
of unwellness rather than classic burning upon urination).