What kind of bleeding can happen 'down there'?

my friend tried a vibrator. it hurt her while but she kept doing that for like a minute. after that she started bleeding but she said that it wasnt like regular blood. it was like mucus in red colour, slimy blood. she descibed it as when you are cold, sick and at the same time your nose bleeds, then you blow and the blood is mixed with the mucus - that kind of thing. she was fine after that, no pain, no more bleeding. and this happened years ago. what was that? blood mixed with l fluids?