How can I make my crush/best friend get over her ex?

I have a crush on my girl best friend and I asked her out a few days ago. She said that she still has feelings for her ex, which I can confirm because we've been talking about that a while back.
I think she kinda likes me too, because she once ditched her friends to go say hi to me. I was out with my friends, she was out with her and I randomly texted her if she wants to just come by and say hello or something. When she got there she gave me a hug and wouldn't let go.
When we first met she found out I play the guitar and she immediately started talking about how she thinks guys who play the guitar are hot.
So I guess if she got over her ex, she'd go out with me. How could I help her with that?