My hamster hurt her foot?

My hamster was chewing on the bars of her cage so I decided to take her out and put her in her ball for a while. After a few mins I noticed she was scratching alot, then I noticed some strings of blood around the ball. I took her out of the ball and put her in the empty bathtub so I could get a good look (she hates being held) and I managed to grab her and the blood was on her feet but nowhere else :S I can't get her to a vet because it's 2am and I'm broke (between jobs) Is there anything I can do besides keep rinsing her feet?