What's the Name of That Book??? discussion

I read this YA novel around 1990, but I think it was written (and set) in the 80s.
The story is about a teenaged girl (possibly named Angela???) from a working class background who transfers to a fancy high school (I think it was a boarding school but maybe just a prep school).
The main character rides a moped or scooter (red?) and uses it to escape from her stuffy new environment. The book referred to the moped/scooter by its brand name ("her Honda/Yamaha/etc.").
The girl had brown hair; she may have been Hispanic, but I'm not sure about this.

Could it be Looking for Alibrandi?

Nope. The book I'm looking for was set in the US and was written prior to 1990.

Corey, are you still looking for this book?

No response, moving to Abandoned.