[BlueLancer]

The answer to Mary Ann vs Ginger is Ellie Mae Clampett.

And the answer to all three is: Jane Angelica Thrift ...

... AKA, Wrangler Jane, F-Troop

[Richard Kimball]

She was fifteen when that show started filming.

She lied about her age and told them she was going to be eighteen, she just didn't say which year.