Do you know what her situation was before she came to you? Maybe she hasn't been exposed to humans much. It's less likely that she doesn't like you and more likely that she is a bit scared of you!
Be calm around her. Don't force her to spend time with you. Just love her! And the more you do and the more she gets to know you, the better it will be. Give her yummy food and treats, a comfy bed, and a relaxing environment.
The alternative is that she might just not be the worlds most affectionate cat. I have two cats with quite different personalities. Minnie is very needy and always wants attention and cuddles, whereas Snookie is a bit more stand off-ish and looks after yourself. But often at night she will curl up by my feet in bed, and that's how I know she loves me.
