Yes looked at her feet. And my first thought was that it was urine, but it's definitely blood. I cleaned her cage and found another small spot by her food dish. My second thought was that it was chinchilla period, but I don't think that happens? I'll just keep an eye on her for now I guess.
Most of the time it is feet. I wouldn't worry too much just watch for more, a tiny cut will close up and be hard to find, but appendages (feet, toes etc) bleed a lot for such a small part and can be alarming
You are correct in that chinchillas do not have a period like humans do. Some have a slight clear discharge during their cycle, but it does not look anything like blood.