They mostly got 'Masters of Residential Science' degrees (commonly called Mrs.) Curiously usually with soon to graduate upperclassmen or grad students.
I remain convinced girl geeks are like unicorns. Mythical creatures. You know someone who claims to have met one once. A few years ago you new lots on non-geek girls claiming the title. But invite them to a true geek fest and watch them run for the exits like...a girl at a geek fest. Tell them a geek joke and watch them stare back at you. (What does 'on a blank disk you can seek forever mean?', never even heard of an eight inch floppy.)
While we had our fair share of bowwows, one girl was SMOKING hot. Smart enough to graduate, but not so bright. Damn, she was HOT, tall, blonde, blue eyed, and spoke Quebecois french. there's something about a chick talking about thermodynamics in french.
As you say, you'll see them as freshmen. Young, attractive women who start out in demanding college majors quickly realize they don't need to - even if they have big IQ's they have many, many other, more straightforward options available to guarantee their future financial security than suffering through years of school. The ones who do stick with the programs tend to come from traditional cultures (China or India) where education is prized and they are getting family pressure to keep at it.
But men and ugly women have no access to such options and need to make money, so they stick with it. ;)