I have had to deal with this issue a lot lately. Seems a particular stud may have thrown it.
U got a pic?
Is it prolapse or a hyperplasia?
Is this her first time prolapsing and which heat is this for her? (1st? 2nd? 3rd?...)
Does the line have a history of it and did other litter mates do the same?

If something shows you that it may be hereditary....Consider having that around and dealing with it again vs cutting your losses.