Sorry, hot girls are never 'nerds'
I know a bunch of average to ugly "nerd girls" are going to disagree with me, as will a bunch of permavirgin nerds who have a crush on some girl who claims to like zombie movies, but hot girls are never nerds. They're hot girls. Liz is far too hot to be an outcast, even if she just wanted to play video games, read comics, and play Dungeons and Dragons all day she'd still be able to get laid by good looking dudes. I hate that TV and movies like to pretend that hot girls can go unnoticed - it just panders to virgin nerds who think one day some smoking hot girl is going to be ignored by enough better men that she'll settle for fat, boring, "nice guy" type fumbling losers.
Chicks like Liz can be as weird as they want, she's thin and cute and plenty of dudes will put up with way more than a few comic books and Star Wars references in order to jiggles some guts.
I wish a show had the guts to show a real "nerd girl" - mentally unstable, plain (at best), poorly dressed, and endlessly attention seeking. That'll never happen, of course, since TV can't even portray male nerds correctly (Hint : they're not quirky, intelligent, moderately good-looking guys with wicked senses of humor).
Either way, I hope Liz gets topless at some point.