What can I do to help my daughter understand that everyone is not the same in relationships>?

How can I get my daughter to understand that just because her friend on facebook baby’s father is there for her that does not mean the world has come to an end. She just cannot come to grips that my grandson dad is not here with her son. I do not know how to talk with her for her to understand everyone is not the same. Everytime she communicate on facebook with her friend, she gets upset by what the girl says and she cries. I do not know what to do. Can I get some imput to this situation?