I think a nice Side by Side too is perfect for a young lady, or maybe under Under and Over. I know I looked at a 20 gauge U and O for a female once. I think it was a Beretta U/O. She didn't want a shotgun, so I didn't get a nice Beretta 20 gauge to use.

If your daughter doesn't mind recoil, then the 12 gauge is more versatile.