According to http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=ances... citing from Stirnet
Only dau and heir of father, John De Gras b: ABT 1320 in Wimpole, Cambridge
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Also married Thomas de Bourne of Studley, Yorkshire (was he of Studley jure uxoris?) Marriage 1 Hugh de Clitheroe Marriage 2 Richard Tempest b: ABT 1309
Thoughts?
Notes in the profile here that describe the relationships
Richard de Tempest, of Bracewell