Black Actress/Singer - Help!?!?

Okay, so I'm trying desperately to remember the name of a black actress who could also sing (but never put out an album that I know of). Her face has been in my head for days and I cannot figure out her name or where I know her from. It's driving me nuts.

Here's what I know.

1. She is black.

2. She was overweight and I think shorter. She had a round face.

3. She has since passed away (I'm pretty sure)

4. She was famous in the 60's, 70's or 80's or maybe all three.

5. She had a very distinct voice. It was higher pitched I think.

6. She may have been on Broadway

7. She may have been in a sitcom

8. She could sing but I'm pretty sure she didn't ever produce an album

I keep seeing her in a 60's type "housewife" dress and singing a song - possibly on a variety show or a special or something but I can't think of what it is.

It's not Della Reese. Everyone keeps saying it is but I KNOW it's not her I'm thinking of.

Any help?