@Nicholas she was definitely the inspiration for betty boop (tho’ the voice of betty was done by mae questal). if you look at a young picture of helen, you can definitely see they made betty look like her (at first, tho’, betty was actually a dog, not a human).
Actually, Helen Kane was the first voice of Betty Boop. She got into a salary dispute with Max Fleischer, who owned the studio that turned out the cartoons, and lost. That’s when Mae Questal took over. See what I mean in this clip: http://archive.org/details/MaxFleischerVictoryNewsreel