Joan de Haudlo - Please, no more screamers!

There most certainly IS documentation to place her as wife of Amaury St. Amand and within the Haudlo-Burnell lineages. Her exact placement in the Haudlo family is uncertain, as she may have been the full or half-sister of Richard Haudlo, or possibly a stepsister. (Both John de Haudlo and Maud Burnell had been married before, John to Joan FitzNigel, of whom Richard, and Maud to John Lovel, of whom a daughter Isabel and son John).

Be all that as it may, her father/stepfather arranged her marriage into the St. Amand family at the same time as that of his heir Richard, circa 1329.

That she was named in an entail along with (definitely Haudlo) sisters Elizabeth and Margaret and "heirs male" of John Haudlo and Maud nee Burnell, is a strong suggestion that she too was a Haudlo daughter of Maud's.