By Paul Wontorek
Updated July 09, 1999 at 04:00 AM EDT

The story — about a young woman who tries to find her birth father — is Lifetime material, and the score is made up of ABBA hits. Still, Mamma Mia! is a winner. Fortunately, the creators acknowledge the kitsch factor — they’ll even yank out Super Trouper costumes for a laugh — and the songs turn out to have theatrical bite. Spunky leading lady Siobhan McCarthy couldn’t ask for a better 11 o’clock number than ”Winner Takes It All.” A