I've gone into said Essex Genealogist article and pulled the sources the author cited:
She married first William Ballard who died by 6 June 1639 [EG article references this is when Timothy Tomlins was assigned to administer Ballard's estate, citing Charles Frederic Farlow, Ballard Genealogy, Boston, 1911, pp 15-16 and adds: "this date is not found elsewhere"].
By him she had John and Nathaniel Ballard. [EQ articles cites Records and Files of the Quarterly Courts of Essex County, VII:199]
She married second William Knight. [EG article indicates he married "Elizabeth (----) Ballard Knight" 28: 1m: 1656 without citation; this same paragraph estimates a 1609 birth for her referencing a 1666 deposition in which she gave her age as 59 years. Later in the narrative the citation for this deposition is given as [Records and Files of the Quarterly Courts of Essex County, VII:199].
When William Knight died in 1654 he named in his will John and Nathaniel Ballard who receipted the legacies “of our father-in-law” (i.e. stepfather). [See previous citation; I think this is there]
In 1654, the surviving children of William Ballard and of William Knight “discharged Allen Bread Sr., the legacies of William Knight, their father.” [EG says "see below" at this quote; the "see below" doesn't exactly match, but appears to be citing Essex Deeds, 2:52]
On 8 May 1854, Edward Richards (husband of Anne Knight) “received of Elizabeth Bread, as executrix of the last will of William Knight, deceased, and of Allen Bread her husband…” There are similar statements by Thomas Gage husband of Joanna Knight, Nathaniel Ballard, John Ballard, John Farrington husband of Elizabeth Knight, and Mary Knight of Lynn. [In the EG article, this quote is mixed in with a bunch of data, all of which appears to be citing, again, Essex Deeds 2:52]
On 22 August 1666, Elizabeth Bread, aged about 59 years, deposed that at the match between John Ferrington and her daughter Elizabeth [Knight] to now a widow… Matthew Farrington promised to bequeath to John Ferrington, his brother, the other half of his estate. [EQ articles cites Records and Files of the Quarterly Courts of Essex County, VII:199]
On 18 October 1681, Elizabeth Breede “late the wife of William Knight” conveyed to her son Nathaniel Ballard “that parcel of land bought by my first husband.” (This record alone ties all three husbands together.) [EG articles cites for this Essex Deeds 6:22]
[EG article states she was not named in the 1681 settlement of Allen Breed's estate.]