Question on the ending? SPOILER WARNING!

Just discovered this classic of Forgotten 70s Cinema...

http://jp.youtube.com/watch?v=L9AF-h2XD80&feature=rec-HM-fresh+div

trivia question; was Lynne Moody, a Playboy Centerfold?

I haven't seen this movie in over twenty years so sorry if this sounds either vague or be slightly incorrect. I saw the unedited version on HBO in the afternoon oddly enough (since HBO back then wouldn't show r-rated movies until after 8pm but then again this was unrated which is how they probably got away with it). Anyway....

Cathy (Deborah Raffin) finally manages to escape the compound (I think some one higher up recognized her which allowed her to leave or maybe something else). Later on she comes back with her dad to the compound to hopefully bust up the seedy ring and also find out what happened to her best friend Diana (Lynne Moody) who also attempted to escape that same night. Unfortunately out of fear none of the other prison women will speak up to confirm what Cathy said was going on until she finally convinces long time prisoner Sarah (Della Reese) to finally speak up. Angry and tearfully Sarah spills the beans on everything that went on included how Diana died (shot in the back while fleeing) and where her body was buried. Cathy and her father leave (I don't remember if Sarah went with them) with the father vowing to make heads roll over the crap that went on here.

I think that is how it pretty much ended. Hope that helps you out.