What does it mean when I say hi to a girl and she just smiles and doesn't respond?

I caught this girl staring at me several times. sometimes she make it obvious and sometimes from the corner of her eyes. i was once in the hall way going to my room in student accommodation and we made eye contact. she smiles and she said " I didn't realize we live next to each other" I said Yeah. I know I should have carried the conversation but I cat a bit awkward when I like someone. Today I was with a group of friends and she came in I said "whatsup jane" she looked at me smiled and looked down and she didn't respond so I am really confused and I really dunno what to do. coz with other guys she seems more outgoing and whenever they say hi to her she smiles and say hi. is she interested and shy or not interested coz I feel sometimes that I am invisible to her and sometimes not?
What does it mean when I say hi to a girl and she just smiles and doesn't respond?
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