After Seeing your Crush(Female) in Mall

I was in the mall with couple of friends. Suddenly I saw my Crush sitting with her friends in Cafe in mall. She saw me and I just gave her a glance. I was shy and didnt respond or said Hi. We dont usually talk. we Just talk on Facebook. I know I screw up every time with these situations and Im feeling sorry now :( The only solution I have is to respond hger on Facebook where I chat with her alot. Please advice me what should I say her on Facebook or How should I start?

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