Maybe a low mileage 4 banger 2 door Altima coupe? Or a used 3.5 Alty coupe?

Maybe a slightly used Pontiac G6 coupe, heck probably get a new one for near that much. For a bit more possibly a convertible model.

I don't know what used Crossfires go for, maybe that much I'm not sure, but your mom might dig 'em.