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Not the same as Margaret Guines and not the wife of Sir John de Burgh, feudal Baron Lanvallei of Walkern
Her name is also seen as Margaret, Marjorie, Margery.
https://www.wikitree.com/wiki/Guines-5
"(That) Margaret was emphatically not a daughter of John de Burgh of Lanvallay, grandson of the infamous justiciar John de Burgh. The younger John did leave 3 daughters, two of whose marriages are well attested (neither one to Richard de Burgh nor any member of that family); the third, who was named Margaret, had become a nun before her father died, so the inheritance was divided only between her two elder sisters. The inheritance was never subsequently re- apportioned to provide for the third sister or any of her issue, and she evidently remained in her cloister to die unmarried and childless. " (Ref: http://archiver.rootsweb.ancestry.com/th/read/GEN-MEDIEVAL/1999-03/... )