I've been around boosted cars for the last 10 years, owned about 15 turbo cars, but only one supercharged car (Cobalt). I know about detonation and melting pistons. The first time I melted a hole in a piston it was in a 90 Eclipse GSX, and the car actually still ran, just sounded like a weed eater.

If she said she heard metallic noises and lost power, I would say there is engine problems. But squealing and losing power I don't get.