I thought this link was pretty cool. Jean died in 1999 and they made this little memorial to her and her character Wilma. They even show the article that talked about how her voice was perfect for the character. Check it out...

http://www.mkbmemorial.com/JVP/

Also, a side note - For anyone that has the first real live Flintstones movie on tape (the one with John Goodman, Elizabeth Perkins, Rosie Odonnell, Rick Moranis and Halle Berry) fast forward to the scene with the party. When everyone starts to do the conga line, Jean Vander Pyl is the person right behind Dino. Very cute.