Crabs is not fatal, but they can be really annoying. Don't let anyone tell you that a condom will stop you from getting crabs because it won't. They do not come from the inside they are like lice and lay eggs and stuff in the hair around your privates. They itch and burn really bad too. They can be gotten rid of, but the treatment is really uncomfortable too. Plus if she has crabs there is a good likely hood she may have something else as well and not even know it. Condoms are NOT 100%, they do not completely stop the transfer of disease or stop pregnancy 100%of the time, so I would say no to her. She sounds to be sort of a slut, and you would be better off staying far from her. Hope this helps. Good luck to you.