URGENT HELP! Blood coming from ball pythons anus, was making really strange noises.

[swanson]

Sounds like a prolapse to me. I really don't know much about them. I think it May be infected. You May need to take your snake to the vets but wait for a pro to answer more on this. Your snake sounds very ill, this seems like it could be worse than a prolapse.

It has completely went back into her anus now, could she just be constipated?

Could be a prolapse.
When was the last shed and how sure are you that "she" REALLY is a she?

Last time she shed was February 23rd, the only reason we "think" its a she is because the lady at petsmart told us when we asked, but you never know. Although we looked up information about prolapsed hemipenes and it didn't seem to be anything really close to what our snake is experiencing.