After careful consideration, I would have to say my favorite score for a Stephanie Fondue movie would have to be THE CHEERLEADERS.
And she was never "the least known" actress to me. I had a major crush on her back in the day...cutest thing ever. But she did do a complete vanishing act...on the DVD commentary, the director states he has no idea what became of her.
A follow up. Several years ago, I looked for info on Stephanie. IMdB had nothing...but I looked today and there is a little new info. Apparently, her real name is Enid Finnbogason and she is from Canada. As of 2012 she was managing a nightclub somewhere in Canada. And yes, her first and only film.
Gentlemen, I'm a bit shocked to learn that Miss Fondue actually exists. I was under the impression that you were making clever puns about her 'vanishing' or 'disappearing' as 'fondue' litterally translates as 'melted' or 'melted away'.