I can find no source for this lady's parents. GENI gives her parents as Roger le Strange, 5th Lord Strange and Aline le Strange but WikiTree does not show Elizabeth to be one of their daughters. Is this an error? Elizabeth does have a WikiTree entry (https://www.wikitree.com/wiki/Unknown-135653) but her parentage is listed as unknown. If the parentage is, in fact, unknown, the parents should be disconnected on GENI as this gives a false lineage to early Plantagenet royalty.
Magna Carta Sureties has no parents for her
https://www.geni.com/documents/view?doc_id=6000000021023887516&
Spencer name comes from FindAGrave
Disconnected from parents & locked relationships.
John Cowles you’re on a roll! Keep it up!
CITATIONClose[1] George Edward Cokayne (1916), New Complete Peerage, 4, London: The St Catherine Press, pp. 288–90
From the Wikipedia article on https://en.m.wikipedia.org/wiki/Philip_le_Despencer,_1st_Baron_le_D...
Has her name as Elizabeth, and that’s all.