Re: Cindy Williams
Curtains is also a possibility.
But don't rule out Momma Morton in Chicago
or Mary Poppins' Mrs. Banks.
Longshots:
Morales in A Chorus Line
Fantine in Les Miz
Frankie Valli in Jersey Boys
Anything available in Legally Blond?
and what about Mama Mia are the roles something Miss Williams can do?
As DR elmore stated, there's no way that she would be right for Mrs. Banks in
Mary Poppins. Just listen to the OCR. However, she could possibly be right for the maid or the "evil" Nanny, but that would all depend on her English accent.
The Longshots are definitely longshots.

And there's really nothing in
Legally Blonde either.
As for
Mamma Mia!, there's a remote possibility that she could play Tanya or Rosie, but, again, those are very remote possibilities. The producers of
Mamma Mia! are against stunt-casting. They prefer to hire "actors" rather than "names".