She goes offline when I come online. What should I do?

gotagrush
Hi , i got a crush about my friend which is in my class... My other friend told her about my feelings and now everytime i open facebook and she is online she goes offline within seconds/minutes which is so weird in school she talks to me etc etc.(Everytime i post a pic in instagram or facebook she likes it) Another weird thing is that this Sunday she saw me in street and turned the head in the opposite direction like a ignore... I don't know im getting sick and tired about her. I really love her but look what she does... What should i do? Should i tell her in face or start ignoring her?
She goes offline when I come online. What should I do?
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