Hannah Lopez and William Shepherd

[wren]

Hi All
I'm looking for advice as to where I should go to find earlier records for Hannah Lopez. Hannah married William Shepherd in 1749 and the couple resided in Petticoat Lane, London. They  had at least three children Hester 1753, Deborah 1754 and William 1760.
William snr died in 1760 and Hannah later married Thomas Peet. Interestingly when she was required to sign permission for both daughters who were under age to marry, she signed as Hannah Shepherd, even though she was married to Thomas Peet.
Hannah died in 1777. Her birth date would be c1722. I have located marriage records for both of Hannah's marriages.

My dilemma is in locating earlier records for Hannah. So far I have been unable to locate any London records for Hannah. If anyone could suggest where I might look for any earlier records. I would be extremely grateful.
Regards
Wren