I've seen only one semi-contemporary record that mentions 4203249Margaret: the inquisition post mortem of her son William.1

The inquisition strongly implies that 4203249Margaret was the daughter of 8406498Robert de Shurland, and the wife of 4203248William Cheyne.1

Her mother may have been 8406498Robert's widow Margaret, who is named in the same record, but this isn't certain.

Sources Cited:

1: Calendar of Inquisitions Post Mortem and Other Analogous Documents Preserved in the Public Record Office, Volume VII, Edward III (London, 1909), page 416.