Girls what is she doing?

She flirted with me a lot in seventh grade and I could tell she has a huge crush on me. But in eight grade on the second day she saw me and is like "awww hi jeff I really missed you!" and stuff like that. But I see her in my lunch every day 4 and 6 and both days I walk right by her on purpose and she doesn't say anything to me never. What should I do do you think shes avoiding me and afraid to talk to me or shes just forgotten about me? O ris she embarred to talk around her freinds and tell me that she likes me or did I do somehting wrong?