Only child

I really struggled this morning to get my daughter to go out and call for her friend,she got her bike out of the gararge and left .......I felt pleased .about an hour later she rang me from the park upset  she said ,"mum my friend has just seen two girls from school,and went over two them i followed my friend sat down with them the girls told me not to sit their they left me out and they made me feel small mum "....................I told my daughter to come home ,she did come home and was really sad ,as again her so called friend let her down again .................She doesn't want to go to summer groups but i know she wants to be out having fun with kids ,i feel so helpless as this is only the begining of the summer holls and she's an only child  x M