Margaret de Warenne - Parentage of Margaret de Warrenne

Good question! She shows up intermittently in various trees, but never, ever with husband or child(ren). Could she have been a child that died very young and barely got mentioned in some obscure chronicle, or is she a "ghost double" for somebody else? (possibly Margaret "Megotta" de Burgh, daughter of Hubert de Burgh, 1st Earl of Kent, born about 1227 or a few years earlier, married to Richard de Clare, 5th Earl of Hertford, 6th Earl of Gloucester c. 1236, died in 1237)