Your Ggma Rosa Amanda WEBBER's marriage in 1913 in Hennessey, Oklahoma should have a record in the Kingfisher County Courthouse.It may even be available on-line.The marriage certificate should reveal more information on her parents and where they were born.
Hennessey, north of Kingfisher and south of Enid, is right on the old Chisolm Trail, today the US-81 freeway, in oil & cattle country.
The Kingfisher Centennial Brick Wall near the courthouse honors the settlers who made the 1889 Land Run. This area was settled by the Cherokee Nation, and houses "The Museum of the Cherokee Strip."
My Webbers migrated from Franklin, Venango Co., PA to Ohio to Kansas to north-east Indian Territory / Oklahoma to follow the black gold = oil.
Gpa Frank Leslie WEBBER (b. Jan. 16, 1876, m. Dec. 10, 1901, d. Nov. 4, 1938) was an oil-driller, lived in Collinsville and died in Porter, Muskogee Co, Okla, although his family moved on to Oregon. He's buried at the Fort Gibson Nat'l cemetary near Webber Falls on the Arkansas River.
His brother William A. WEBBER b. ~1872, d. Nov. 1940, was a drilling contractor for the Prairie, Carter, and Texas Oil Companies.He is buried in nearby Okmulgee, Okla., which was settled by the Creek Nation and oil pioneers.
William W. had two sons and a daughter, but their names are unknown. The dates are about right, so it's probably worth checking out. If your search shows that her father was William of Pennsylvania, let me know.... I can share much more.
Another point of interest: a Walter aka Lewis Webber was an early chief of the Cherokee nation, and figures prominently in the region's development. Webber Falls was named in his honor.