Avelox and blood samples

I am not sure if this is from Avelox--but I found this site because my mom called me today telling me she has blood in her urine. It's really blood, a lot of it, and not "dark urine", and yes I am very worried. She stopped taking Avelox because of some other side effects 2 days ago. She was prescribed the drug because of a gastrointestinal flu that was going around. (As you may know flu's are caused by a irus, not something that can be stopped by an antibiotic) Now she also has weakness and abdominal pain on the side.

She had ovarian cancer 7 years ago, had an accident one year ago and was hospitalized and had surgery, so we are extremely concerned--especially so because apparently doctors don't ever seem to take her precondition serious when prescribing treatment for any other minor illnesses and injuries, instead in one instance the eyes lit up and they xrayed her 5 times instead of one, when she had NOTHING against my will and her feeble doubts at one time. I am sure her sensitive condition--all those toxic substances sitting in her organs-- was NOT taken into account this time either, and she only has one kidney. As you may know, all antibiotics are hard on kidney and liver, so i was really shocked to hear about the known side effects of this one prescribed to someone who had so much hospitalization and toxic substances in her body already. At this point they have brought blood samples to a physician. Nobody seems to feel like hurrying anything, while she has blood red urine every time she goes to the bathroom!

i wonder if the precondition affects the range of possible side effects as well? The last straw that broke an organ? Probably. If you have any input on this, I would appreciate it, it will only be hard for me to check it because I will go stay with her and they have no internet.