Getting ex girlfriend attention.?

About 2 weeks ago my ex "wanted nothing to do with me". I ran into her in town one night and she glared at me and wouldn't even really talk to me. She sent me a couple texts so I figured I would get her some congratulations flowers for her finishing her college term. She caught me putting them on her doorstep(they were still in a box she didn't know what they were). She talked to me a bit and gave me a hug and was really nice. That was Friday and I haven't heard from her since. I'm getting mixed signals and don't know what to do. ANY ADVICE???????