It is very common for snakes to bleed a little at the vent when shedding. I honestly do not know why this happens but I have noticed this with most of my older female ball pythons. Never with my males. Not sure if this has anything to do with genders but I thought I would throw it out there. So if your snake shed, it is most likely that. I would wait till her next poo and if there is blood and no shed, I would take her in. It is pretty hard to tell you what to do without seeing it myself so ultimately the decision is yours. It never hurts to get your snake checked whether there is or is not something wrong with her.
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