Regarding Estella in the 1930 Census in Belle Plaine, IA: I think her son's name was Frederick B. Hrabak. I also suspect she was married to the Fred W. Hrabak, a watchmaker who was living in a hotel in Ottumwa, IA at the time of the census. If these folks are your family, I have a lot more information, and a photo of Fred W.
Naomi