No miss kitty was not a hooker when the show started. She owned the saloon the long branch. She was a madam yes the long branch was a gambling hall, saloon and a whore house.

It was protected by Matt Dillion miss kitty was his girl friend and partner in the place.

They both died shortly after the series ended from venereal desease. Miss kitty retired from being a whore when she took over the long branch. But the VD was already in her and in Matt.