I like her but she doesn't like me?

So I know this really cute girl that found out I liked her. She told me she only saw me as a friend and nothing more so I played it cool and told her that's ok, but I still want to make her mine though. I'm still talking to and texting her but idk if it's much of a good idea to continue doing this because now I feel like I'm just being a nuisance. Is there a way to get a girl who knows you like her to like you back?