A good choice for a marketing position for a chick would be a Stacy-tier sorority leader since she would know how to get folks to go along with stuff.
A lot of women go into marketing roles. It's also worth mentioning that marketing is broad and can cover many different types of roles.
A better than average looking, ex-sorority chapter leader might work in marketing. However, more of those women would be likely to work some sales representative job instead. Both pharmaceutical sales and medical device sales prefer to employ attractive women. New representatives were often in sororities in college and/or were college cheerleaders.
Women in "brand management" type marketing roles tend to be more careerist and less attractive. A lot of the "brand management" roles go to people with MBAs from elite school. Attractive women don't need to go through the effort of getting an MBA, either from an elite school or a non-elite school. Within marketing, the more attractive women likely work in creative roles, often times at advertising agencies, which are roles that typically go to those with bachelor's degrees from non-elite universities.
As for unqualification to sell beer, this is more of eggheaded elites thinking they know what makes their customers tick.
A lot of bigger name companies prefer to hire new MBAs from elite universities. This is a common practice across business functional areas, including Marketing. That's a hiring practice that is somewhat controversial, especially from the viewpoint of MBA graduates from non-elite schools. As a result, the value proposition in attending a school not ranked among the Top 25 MBA programs is questionable.
Alissa Heinerscheid did her MBA level internship at General Mills, a big name company with packaged food brands. After her graduation from U of Pennsylvania's Wharton School of Business, she worked a "brand management" role at Johnson & Johnson.
Prior to the InBev merger, it is likely that the marketing talent hired at Anheuser-Busch was less likely to be graduates of elitist universities. In those days, they were more likely to hire non-elitist MBAs or people with bachelor's degree from non-elitist universities.
Someone with an MBA from an elitist university is no more likely to be a good "brand management" marketer than someone with an MBA from a non-Top 25 program or even someone with a bachelor's degree.