How do you get a person who likes you to leave you alone?

I've been ignoring this girl for nearly one month. She tells all her friends that she has a crush on me, and through them she tries to force me to date her. Yesterday was Valentine's Day. She made me a card consisting of glitters and some gothic-looking stuff. Made me a poem. Through that poem she was basically telling me if I don't give "love" a chance...and some other stuff. I don't know. She's not getting the message. Ignoring her completely doesn't seem to do the trick. This is nothing personal. Though she is on the fat side, I wouldn't date her if she were the most attractive girl in the world. I've never been with anyone and I don't intend to be. That's just the way I see my life. I don't want to have another. I want to be alone. I choose this life. She doesn't want to accept this and it is driving me insane.