Should prescribed antibiotics still be taken for a UTI if treatment is delayed?

Antibiotics for a bacteria found in mom's urine was prescribed, but it's been now two weeks since the symptoms began and one week since symptoms subsided and urine sample were taken.

Mom's blood and urine labs were delayed due to a few reasons: home health nurse reschedules, mom not consenting to go to ER, and the doctor's delayed call after a weekend of the results. She is just weak and in bed now.

I read somewhere that antibiotics when no longer needed may be harmful. I looked up other forum posts on uti's but now can't find the one on delayed treatment. I called the doctor back to ask if a delay in the treatment still warranted?

The doctor and home health seemed to be focused on encouraging hospice. Anemia and now late UTI diagnosis are not convincing that she has six months. Maybe if it were kidney failure related which she is exhibiting moreso, but the labs do not show this as a concern now.