Brick wall - searching for the birth & death records of my maternal great-grandmother, Nettie (Williams) Foust

Hi All: I'm searching for the birth and death records of my great-grandmother, Nettie Williams. Here's what I know: My brick wall is with my maternal great-grandmother, Nettie (Williams) Foust. I have a record of Nettie Williams and Eugene Foust getting married on September 1, 1915, in High Point, Guilford County, NC. They then moved to Norristown, PA right after marriage for Eugene's employment at the Magnesia Plant in Port Kennedy. They had at least eight children between 1916 and 1926. It is believed that Nettie passed away sometime around or after 1926, and the husband and children were scattered all over the place. My issue is that I can't find Nettie anywhere after giving birth to her last child/my grandmother, Delores in 1926. I am unable to determine exactly when and where Nettie was born and when and where Nettie died. I have the middle of life, but nothing showing her beginning or her end.

I love researching and I'll perform the legwork myself, I just don't know where else to look.  Any assistance on direction would be greatly appreciated.  Thanks in advance!