The vet called me a couple of hours ago to tell me that he found no white blood cells or blood in her urine, so it's not a UTI. He did say he found some type of crystals (which I guess aren't bad ones) and said that the urine seemed diluted. Hopefully it's just because she's been drinking a lot of water.
He suggested that I finish the anti-biotics for the rest of the two weeks, and if she gets worse to bring her in for blood tests and x-rays. I am going to watch her closely for the next few days to make sure she is okay.
She seems to be acting normal and not drinking as much anymore so I hope it stays that way.