Anne le Despenser - Did she exist?

Was she really married to Sir William de Ferrers of Groby?

Did he or they really have children -

Maud 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://s3.amazonaws.com/photos.geni.com/p13/bb/fa/cf/28/5344485e78...