I don't think Gale was actually in Mensa
Gale claims to be in Mensa but she works in a Mexican restaurant, and doesn't show any signs of above average intelligence?
I think it's just something that she told Elana, and now has to live with it forever. Which is kind of something that Mark would do.
Basically, Gale and Elana seem like the female version of Mark and Jez.
Anyway, I haven't got time for all this. I need to go assemble an enormous salad.