I had already tried Find-a-Grave. Nothing. Mom once showed me what she thought was the cemetery, but didn't know exactly where the grave was. She said the grave was unmarked. I can no longer ask my Mom about which cemetery it was as she died several years ago.
There is one sibling remaining, however she was only a year old when Aunt Iva died. But I will call and ask what if anything she may have heard as she was growing up.