she is giving you all the signs that she likes you. Ask her out. Outcomes:

She says yes. You have fun. You fall in love. You get married.
She says yes. It goes well or badly, and you go out more or you don't. And then it ends.
She says no. It sucks and then you move on knowing you tried.
You do nothing. She marries someone else. You never talk to her again and you wonder what would have happened if you'd asked.

The only really bad outcome there is from not asking her out.