wat should i do

when i was 16 i met a 9 year old i know her cousins they live in my neighborhood and we play basketball. But anyways shed come outside while we were playing from time to time, her and her two sisters and id talk to her and get to know them/her and she made me feel so special when id come around shed smile and be so happy to see me but they were only visiting so they left and i havent seen her in a year and i cant stop thinking about her i dont know why id do anything to see her again and i dont want to ask her cousins about her cause why would i be asking for a little girl and its not like i like her as in a gf i dont shes just really important to me now i miss her what should i do?