Some people, like myself, don't feel as though friendship is necessary with coworkers who are only going to be there for a few months, at most, unless they really connect. I try not to be rude to people, though. It takes a long time for me to warm up to new people, and it's not because of insecurities; that's just the way I am. A "friendship" that only last a month or so and that is only through the workplace isn't worth the trouble, IMO.

I am married with two kids and haven't gotten all the way through college yet. I can only work certain hours a week, nights 5pm to close. I only get to work with a few other people who can only work nights, and most of them are younger than me, are not married, don't have kids, still live with their parents, and are full-time college or high school students. There's not a lot to talk about, and they could quit at any time. So that's usually why I don't bother with new people.

If it bothers you so much, maybe ask her why she doesn't seem to like you. You might be missing something.