Definitely at least have a recheck done on her urine, ChrisKam. The meds maybe didn't clear the infection totally.
Something else to consider is the health of her kidneys. If she's having some decline in kidney function, it might also show up as incontinence. A blood test can give the vet some information on organ function.
Meanwhile, is there some way to confine her to a crate or an area with pee pads, safely away from the hardwood floors, when no one is home?
Good luck with your girl. I hope your parents are willing to wait at least till the results come back!