I dont think its a problem of “over-education” so much as what field you are “over-educated” in.
OT/PT for example. To become an OT/PT you need to go through the same 3 years of Graduate School that you need when pursuing a law degree (and in my opinion it is much tougher). There is a nice group of Frum girls in the Downstate and NYU OT/PT programs, those programs are no joke, they are extremely competitive.
For some reason OT/PT/Speech Therapy has become acceptable fields for Frum girls to pursue. They are no less educated than a girl who graduates with a law degree, becomes a Dentist or an Eye Doctor, they just have different passions.