Just for info:
I just looked at the fiches in Portsmouth RO and it seems like the possibilities are
Mary Ann Webb (baptised 24/12/1802) daughter of John and Mary
Mary Ann Farndell (baptised 17/7/1803) daughter of Arthur and Phoebe
and a few Marys - Rogers (ds. of William/Mary or William/Phoebe), Duke (Edward/Mary), Cox (James/Ann), and Coxe (Matthew/Mary).
familysearch.org gives the same results if you search on Warblington rather than Emsworth