Why she actin like this?

Me and my 4 best friends seat 2gether @ lunch, but for the last couple of weeks one of my friends has been eatin lunch w/ us and leavin 2 talk 2 her other friends for recess. I was fine w/ tht @ first but now she just seats at the lunch table and doesn't even talk 2 us. lunch is the only cl we have 2gether. I talked 2 her yesterday bout it but she didnt listen 2 me and now shes mad at me. I don't no wat do?