Go for it. It's better to have tried and lost than not tried at all. Trust me, I've been down both paths and I have much less regret for the times I just said "**** it" and took the leap of faith.
EDIT: Just saw this:
So what's the worst that could happen?
This is pretty much everything that can possibly go wrong here, from personal experience:
1. She'll say no. If she has a boyfriend, move to 1a. If not, and if #2 isn't a factor, that'll be the end of it.
1a. If she's the spiteful sort, she might tell her boyfriend about it in an attempt to sick him on you. If this statement is mostly true, move to 1b. Otherwise, that'll be the end of it.
1b. If her boyfriend is the 'violent when jealous' type (as most are) it'll end in one of two ways; either he'll kick your ass, or you'll kick his. Otherwise, you'd be best just sticking clear of them. Either way it's her loss.
2. She'll say no. If she has no boyfriend but does know most of
your friends, and if she's the spiteful type, move to 2a.
2a. It's possible that she may attempt to turn your friends against you by turning your advances into something way more serious (and untruthful) than they really were. It's not important for her to make your friends believe her, it's only important that she plant the seeds of doubt in them. After the initial war is over, it won't seem like a huge deal. But sometime later, maybe days, weeks, or even years, your friends might turn on you over such a small thing simply because they doubt you.
But yeah man, go for it. If it all falls down around you there's nothing like moving to a new town just to get away from such a nutcase.