Is there documentation for her birthplace as Delaware?
Her father was a member of the Provincial Convention at Carpenter's Hall, Philadelphia in 1776. (Source: https://www.legis.state.pa.us/cfdocs/legis/BiosHistory/MemBio.cfm?I...)
Is there any record of the family living in Delaware?
Seems more likely she was born in Pennsylvania, unless the family was staying in Delaware while John was at the convention.
Cheryl