I saved this note about Sarah and Jacob that was in Pendleton's Oley Valley Heritage book:

"Stover was a Mennonite. His name was Stauber, and he was one of the earliest settlers in Oley Valley in 1713. He left Oley in 1723 following Sarah's premature death and was a developer of German-settled settlements in northwestern New Jersey and the Shenandoah Valley of Virginia."

source: p 128 of 'Oley Valley Heritage: The Colonial Years' by Philip Pendleton, pub 1994.

ON p 114 of the book there is a photo of the 'House of the Stauber-Leinbach Homestead' circa 1715-1730 in Oley. Proprietor of the homestead had been Jacob Stauber 1713-1723. Johannes and Anna Elisabetha Leinbach had entertained a stream of Moravian missionaries 1736-1741 including Count Zinzendorf and his daughter Benigna.

Marriage at Christ Church, Phila:
1715, March 15, Boon, Sarah, and Jacob Stuber.

I assume Sarah was disowned by Quaker MM since she married 'outside'?

The Historical Review of Berks County, April 1949, Boones of Pennsylvania, by ISAAC CRAWFORD SUTTON:

Being a cautious man, before venturing to the new country. George sent his three oldest children. George Jr.. Sarah. and Squire (Daniel's father). to size up the situation here. They sailed for America late in 1712, and on their arrival settled near the Abingdon (now Abington) Friends Monthly Meeting, in Bucks County. Sarah married Jacob Stover, and soon afterward moved to Oley Valley, then in Philadelphia County, now in Berks, about eight miles east of Reading.

Although the children's reports to their father were most favorable, it was five years before he finally emigrated to the province, bringing with him the rest of his family. They sailed on August 17, 1717, and arrived in Philadelphia some seven weeks later, on October 10.

After a short stay with his children in Abingdon. George and his household settled in North Wales and became members of the Gwynned Meeting. Two years later George moved to Oley Valley along with his son George. Jr. There they purchased about 400 acres along the Owatin (now Spring) Creek and built their cabins. His daughter, Sarah Stover [sic Stauber] and her husband Jacob lived nearby, having moved there in 1714.

Soon after settling, George Sr. and his family organized the Exeter Friends Meeting in the Valley, and gave the ground on which the meeting house still stands. Here many of the Boones lie buried, and also some of the Lincolns: for Mordecai Lincoln. great- great-grandfather of the "Great Emancipator," lived in the vicinity and the two families intermarried.