I did wonder whether the William Page below (born Wick & Abson) is perhaps related to Sarah Jones (also born Wick and Abson), making Margaret her niece through William..

Name: William Page
Age: 0
Birth Date: 1813
Baptism Date: 28 Aug. 1813
Baptism Place: Abson, St James, Gloucestershire, England
Parish as it Appears: Wick and Abson
Register Type: Parish Register
Father: Henry Page
Mother: Margaret Page

There seems little way of really nailing that connection down though.

Thanks for all your help so far. I really appreciate it!