Infornation on Hazel D. Stevens Harvey

I am trying to find information about Phyllis, daughter of Hazel D. Stevens Harvey Dalton.  Hazel married Lawrence Harvey in 1941, so I'm assuming Phyllis might be his daughter, but I have been unable to locate any information about her other than the fact that Phyllis' last name was Johnston when she was listed in her mother's obituary in April of 1976.  Can anyone help????