Well done, Heywood. That is clearly Frances Letitia Willdale.
John Willdale and wife Frances Letitia Mayes are the only couple with these names baptising children in that parish at the time (and wife's is quite specific).
With a surname like Willdale you are always going to find strange spellings. 6 children appear to have been baptised at St. Pauls, Bedford to John and Frances Letitia:
Francis (spelt male way) bp.3/5/1758
Ann bp.17/9/1766
Frances Letitia bp.27/4/1768
James bp.23/9/1769
William bp.23/7/1771
Rebecca bp.Feb.1773, bur.18/5/1774
The surname varies in spelling - Weldale, Waldall, Waldon and Weldon.
Annette