If you can take a picture that would help, sounds like she might have gotten her toe caught on something and got a thread stuck? No bleeding is good, but that doesn't mean it couldn't if it splits more. Remove anything fabric in the cage, and avoid covering the cage with towels or blankets that have looped thread.
I'd really need to see, but keep flour or cornstarch on hand if you don't have quickstop powder that you can tap and hold on the bleeding. Other than that you might need to call the vet or bring her in just to be on the safe side, but if it's just minor she should be just fine.