cant respond to Mildred Talley Mcdonald

I did not add Mildred Talley McDonald as a friend accidently. She has responded to me & I can not find her as a member she was there under Talley Saturday evening . She responded yesterday & I can not respond to her. Does anyone know what is up? any ideas? How can I connect with her any other way?
thanks in advance to anyone that can help
Mona.