Rectal/Vaginal fistula - Adding muscle to rectum

My 34 year old daughter had stage 2/3 rectal cancer diagnosed March 30, 2004. She underwent chemo and radiation for six weeks prior to surgery in Aug. 2004. She then went through another 5 months of chemo as a procaution, as they found no lymph involvement even though they suspected there was before her first chemo/radiation. Her tumor was right at her rectum and the surgery did remove part of her rectal muscle. She had an iliostomy for 11 months and had that reversed 3 months ago. She has just developed a fistula between her rectal and vaginal wall. Has anyone had this surgery to correct this opening and how successful was this? Is there anything we should know before this is performed? Her doctor is out of town this weekend and he doesn't know about this fistula. I want to be prepared and informed. I am the main caregiver to my Daughter and she is so scared. They are talking about adding muscle to her remaining rectal muscle to help her be continent, which she has been able to reach yet. She is willing to try anything to avoid having her bag back. Can anyone help me?