Is this girl intersted or not interestedin me i need help?

ok so i like this girl and when i talk in person to her she smiles laughs and looks at me sometimes, but she doesnt wave hi to me in the halls when i c her but idk if she sees me and we bearly ever p eachother, online she will reply most of the time and talk alot but she never sends any of these =) or anything like that, whats weird is whenever we have a great conversation online the next day she either wont reply to me or she wont sho up in the hall to talk to me but the day after that she does and is all happy, i bearly ever text her but when i did she text back once and the other times she was at practice and said sry that she didnt text back, um so what i want to know is does she seem interested or not interested in me cuz i really like her and i want to know