It might be worth the drive to go to a certified reptile vet if he/she is not one. Also i don't think this is normal for any snake. Poop should be solid and some fur is ok, but too much means other things. A rat tail in the feces could mean something might be going on inside, maybe she ate a bad rodent.

I would skip feeding if you could, just to be safe, unless of course shes all ready for it and the vet will probably want a Fecal sample.