there's no mention of other spouses in her ipm, though that wouldn't rule them out, I suppose.
“KATHERINE WIDOW OF THOMAS DENGAYNE, KNIGHT
Writ 15 Jan. 1400.
BEDFORD. Inquisition. Biggleswade 29 Jan
Thomas de Stratton, parson of Blatherwycke, and Thomas de Stanes, parson of Upminster, by a fine of Edward III [CP 25(1) 287/45, no. 508: licence CPR 1345–8, p.246] conveyed the manor of Sandy and the advowson of the chantry of St. Nicholas in the church there, which Roger de Bello Campo then held for life, after this life interest to John Engayne for life, with remainder to his son Thomas, Katherine the wife of Thomas, and the heirs of their bodies, and failing such heirs to the right heirs of John. John is dead, and Thomas died without heirs by Katherine. The right to the manor thus remained in fee simple to Joyce then wife of John de Goldyngton, Elizabeth then wife of Lawrence de Pabenham, knight, and Mary then wife of William Bernak, knight, as sisters and heirs of Thomas, and daughters and heirs of John Engayne. Katherine held it when she died. By another fine of Edward III [CP 25(1) 288/50, no. 780] John and Joyce Goldington and Lawrence and Elizabeth de Pabenham conceded their rights in this manor to Mary and William Bernak, to hold to themselves and their heirs after the death of Katherine, who attorned to them. William Bernak died, and Mary married Thomas la Zouche. The manor is held of the king in chief, service unknown, annual value 100s. Katherine died on 31 Dec. last. Mary is aged 50 years and more. John, son of John Courtenay, is next heir by blood to Katherine and is aged 24 years and more.
Writ 15 Jan. 1400.
NORTHAMPTON. Inquisition. Kettering Friday 23 Jan
She held the manors of Laxton, Blatherwycke and Bulwick, and the advowson of Blatherwycke. They were conveyed by fines, levied in 1354–5 and shown to the jurors [CP 25(1) 287/45, nos.501, 508], by Thomas de Stratton and Thomas de Stanes, parsons [as above], to Katherine and Thomas, her husband, the son of John Engayne, knight, and the heirs of their bodies, with remainder to the heirs of John. John died and Thomas died without heirs by Katherine. The reversion therefore remained to Joyce, Elizabeth and Mary [as above] the daughters and heirs of John. By another fine [CP 25(1) 288/50, no. 780] John and Joyce Goldington and William and Mary Bernak conceded their rights in these manors to Lawrence and Elizabeth Pabenham and the heirs of Elizabeth. They died leaving issue Katherine, married to Thomas de Aylesbury, so that Katherine and Thomas de Aylesbury are now the heirs. Laxton is held in chief of the crown, service unknown, annual value 100s; Blatherwycke, annual value £7 6s.8d., and Bulwick, 40s. with the advowson of the former, are held of Thomas Maureward, knight, of his manor of Weldon by knight service, amount unknown. Date of death and next heir by blood as above. Katherine Aylesbury is aged 28 years and more.”