Girl's Behavior

I don’t know what she wants how can I tell?

I met this girl through people we both know and we hit it off and things were going great. We talked and joked around all the time and then now she seems weird around me suddenly, when I see her she is flustered, running around etc. it’s making me uncomfortable and I don’t know what to do or how to handle her behaviour. I always catch her staring at me and being fidgety, nervous when I’m close or she looks around if I walk past. I don’t know how to bring it up with her but she’s acting different and don’t know what it means or why she is doing it. I think she’s a shy type of girl but she does some weird things as in sometimes she walks off when I approach her or she’ll try get my attention but then ignores me. Sometimes she talks with others and looks at me then away. I feel like she wants something from me but I can’t tell what it is. She’s a lot younger then me and a bit immature.
I don’t know what she wants how can I tell?
Post Opinion