In alphabetical order:
ALL TIED UP - "J.J." - 1994
Un Soltero con Mucha Cuerda (Spanish dubbed version) - "J.J." - 1994
GYPSY - "Agnes" - 1993
made for TV movie starring Bette Midler. Rachel has a non-singing role.
The Investigator - 1991
made for tv movie about a P.I. whose life is changed by a homeless woman.
SING - "Cecelia" - 1989
Rachel plays a small role, but she does get to sing one song.
still shot of Rachel from the movie SING
Curse of the Corn People - early 80s
The only thing I know for sure about this movie is that Rachel was in it.
Also of interest is that around 1992 Rachel appeared in a touring production of "Theda Berra - The Vamp". I don't think this was ever filmed though.