"She's such a Betty!" (L/R) Betty Boop 1930s, Betty Cooper of Archie Comics 1940s, Bettie Page 1950s "Queen of Pin up".
1.) The sweet, attractive girl next door type. The one with the cool personality and trendsetting style. "She's such a Betty!" 2.) A pin up gal. She can model any character with style. 3.) Reference to a maid servant, like that of Jeeves. 4.) Based on the Emmy award series, Ugly Betty, she falls under the ugly category.
Via Hulu series Harlots
1.) A prostitute or Covent garden nun who sells pleasure and fantasy to men, preferably those with a title (Duke, Earl, etc.) or very deep pockets.
2.) A sexy woman or tart who is too hot to trot. She knows her power and uses it well.