The Joane French Bridges issue has little to do with her baptismal date.
It has more to do with the various personas who become entered one place or another as as a wife of immigrant, pgm John Bridge. After some period, those wives disappear, only to rise again with some other slight twist to their identity.
Such is the case of this Joane, as it has been the case with others before her--Marjory French, Susan Marjory French, Susan French, Elizabeth French.
Joane Bridges had a dob 28 Feb 1576 in Assington ... Elizabeth French has 28 Feb 1576 in Essex; Susan Marjory was merged, but she had a dob in 1576, probably was 28 Feb 1576 ...
Marjory French on the Ammons site, has dob as 25 July 1580, which has been "borrowed" from Jacob and Susan's son William.