Was she really married to Sir William de Ferrers of Groby?
Did he or they really have children -
Matilda (or Maud) de Ferrers & Lady Anne de Ferrers?
It seems he had one child only - https://en.wikipedia.org/wiki/William_Ferrers,_1st_Baron_Ferrers_of... - by wife Anne Durward, a daughter of Alan Durward and Margery of Scotland.
https://en.wikipedia.org/wiki/Alan_Durward
And that https://www.wikitree.com/wiki/Ferrers-162 had a wife, “ Ellen, recently identified as the wife of William Ferrers, 1st Baron Ferrers of Groby (d. 20 March 1324/5).[8]”
See https://media.geni.com/p13/bb/fa/cf/28/5344485e789c839d/tsg_the_ear...
