Anyone experienced with kidney problems?

My ex MIL has been having lots of back pain, nausea and yesterday was really dizzy/fatigue and having pains around her kidney area for the past week.

She thought possibly UTI but has no symptoms of burning or discomfort at all when urinating or going to the bathroom or anything. I had her take some AZO see if it helped and it didn’t.

I’m a little concerned about maybe kidney stones or kidney infection?

Does this kinda sound like itcould be that?

On note- I know nobody here is a dr but just looking for helpful tips/advice.