Here's her birth on Ancestry:
"Massachusetts, Town and Vital Records, 1620-1988," database with images, ''Ancestry'' ([https://www.ancestry.com/interactive/2495/40143_265675__0003-00072/5764557 Massachusetts Vital Records] : accessed 30 May 2018), entry for Rachel, daughter of Joseph Allen and Mary Coit, born 26 Aug 1711; citing Town and City Clerks of Massachusetts. Massachusetts Vital and Town Records. Provo, UT: Holbrook Research Institute (Jay and Delene Holbrook).
I didn't see it on FamilySearch
Sadly, most people have no way to check an ancestry entry without paying. I may leave them but I definitely try to find something else. I know some trees like on geni or familysearch itself actually LIST sources.
https://www.geni.com/people/Capt-Joseph-Allen/6000000000995798074?through=6000000000966175744
https://archive.org/stream/GLOOriginalRecords16941762Images/GLO_OriginalRecords_1694_1762#page/n0/mode/2up
Gloucester Mass town records. 1694-1762 (actually I don't find anything here)
https://archive.org/details/GLOBirthsDeathsMarriages16341727Images
Sometimes it is easier to find info and put it in the right profiles. LOL
The profile on Geni just says 1655 for Richard Tandy Sr's birth. Sara Tipson on the other hand has a wee bit more: Born February 9, 1662 Saint Martin, Birmingham, Warwickshire, England, United Kingdom