The index gives several pieces of information that are unsourced and appear to originate in amateur genealogy:
maiden name: Jacobs - there is no evidence for this
birth: 1593 in Essex - 1593 is as good an estimate for birth year as any, but the birth place has no source; according to Frederick Clifton Pierce (a questionable source for her husband's ancestry, but probably the earliest published source for her husband), her husband resided in Bristol (at least before emigration) and his ancestors could be found in York
death: 31 Dec 1662 in Portsmouth, Newport, Rhode Island - this is feasible, but not sourced