What should hamsters do if they dig nosebleeds?

She'll take care of it herself, so don't worry too much. Animal instinct is still very strong. They can handle their own wounds. If it is not particularly serious, it is recommended not to interfere artificially. If there is more than one in a cage, I suggest you observe whether they bite each other. If so, you must separate the cages. If there is only one, leave it alone. Also, don't feed wet food for the time being. Wet food is easy to rot and infect at the wound. Just pay more attention to observation