Need some help with a story I'm writing...

I need some help brainstorming something for a short story I'm writing.

Okay, so imagine there's a very shy girl in an American (or English, or Australian) high school. She and her mother moved to town from Canada. Her father is out of the picture, but no one knows why, and she never talks to anyone about it. She dresses plainly, never wearing anything fashionable or eye-catching. She doesn't participate in after-school activities and seems to have no friends. She keeps up with her classes and gets fine grades, but she fears getting involved with anything social.

Now, what sorts of rumors would start about a girl like that among her fellow students, do you think?

I'm thinking something would start up about her imagined involvement with some religion or other cultural group. (She's a quaker, she's been home schooled and forced to stay indoors before this year, etc.)