You're a Pisces, and she's a Cancer? -and you've started out as friends. Sounds like a good start in general.
Don't rush it. Your friendship is just as important, if not more than worrying about moving the relationship into something else. If she's a Cancer - then she is probably sensitive and may be aware of your feelings more than you realize, so you shouldn't have to force anything - just take it slow.
If you're creative, why not create a little gift for her? - like a picture, or some music, or write a short poem - just don't get over possessive or too passionate with your words or images. Focus on your friendship and the trust you share and how much that means to you.
Most Cancers I know are family oriented and like to feel secure, especially financially.