I don't particularly think that this was the direction that Weiner was trying to take.
Well there is the actor/model aspect, but there's obviously a difference in modeling and opera. Seems like she was less proper, seeing as how she ordered the Chicken Kiev, even though Don reminded her that she needed to wear a bib. There's a big difference between Mt. Holyoke (Catholic) and Bryn Mawr (Quaker), too.
But seeing as how I once sympathized with Betty, she is turning into one of the show's main antagonists now, I think.