I think Opal and Frank must have married in Arizona as they are listed their together in U.S. City directories for1947 and 1948 Phoenix as Frank W. Bryan and wife Opal Frank is listed as a mechanic in the 1947 entry living at 1308 - N 18th Ave.
1948 he is listed as employee of Smith Iron and Metal and living at 1310 - 18th Ave.
Since you know the birthdate and name for your Mom have you tried writing to the Arizona vital statistics office to see if you can get a copy of her birth cert.?
That's really the only thing I can think of as I cannot find Opal Henery/Henry in 1940 census to see children. Do you know where Opal would have been living in 1940?
Also do you know name of her Henery.Henry husband?