It sounds like she has a vaginal prolapse. There are several different types of vaginal prolapse and only your doctor or surgeon will know what type it is.
"The following are types of vaginal prolapse:

•Rectocele (prolapse of the rectum) - This type of vaginal prolapse involves a prolapse of the back wall of the vagina (rectovaginal fascia). When this wall weakens, the rectal wall pushes against the vaginal wall, creating a bulge. This bulge may become especially noticeable during bowel movements.


•Cystocele (prolapse of the bladder, bladder drop) - This can occur when the front wall of the vagina (pubocervical fascia) prolapses. As a result, the bladder may prolapse into the vagina. When this condition occurs, the urethra usually prolapses as well. A urethral prolapse is also called a urethrocele. When both the bladder and urethra prolapse, this condition is known as a cystourethrocele. Urinary stress incontinence (urine leakage during coughing, sneezing, exercise, etc) is a common symptom of this condition.


•Enterocele (herniated small bowel) - The weakening of the upper vaginal supports can cause this type of vaginal prolapse. This condition primarily occurs following a hysterectomy. An enterocele results when the front and back walls of the vagina separate, allowing the intestines to push against the vaginal skin.


•Prolapsed uterus (womb) - This involves a weakening of a group of ligaments called the uterosacral ligaments at the top of the vagina. This causes the uterus to fall, which commonly causes both the front and back walls of the vagina to weaken as well. The following are stages of uterine prolapse:


◦First-degree prolapse: The uterus droops into the upper portion of the vagina.


◦Second-degree prolapse: The uterus falls into the lower part of the vagina.


◦Third-degree prolapse: The cervix, which is located at the bottom of the uterus, sags to the vaginal opening and may protrude outside the body. This condition is also called procidentia, or complete prolapse.


◦Fourth-degree prolapse: The entire uterus protrudes entirely outside the vagina. This condition is also called procidentia, or complete prolapse.

•Vaginal vault prolapse - This type of prolapse may occur following a hysterectomy, which involves the removal of the uterus. Because the uterus provides support for the top of the vagina, this condition is common after a hysterectomy, with upwards of 10% of women developing a vaginal vault prolapse after undergoing a hysterectomy. In vaginal vault prolapse, the top of the vagina gradually falls toward the vaginal opening. This may cause the walls of the vagina to weaken as well. Eventually, the top of the vagina may protrude out of the body through the vaginal opening, effectively turning the vagina inside out. A vaginal vault prolapse often accompanies an enterocele. "
(emedicinehealth)