Commentary
Weis lists her as the daughter of Hildouin III and Alix de Roucy. It is apparent by examining the line numbering, that Weis had removed a generation since a previous edition of the his book, implying the typesetter omitted a line.
Family
ClaimDetailEvidence
FatherHildouin de Ramerupt IV, Count of Montdidier (e1010-~1063) [S756] [S905]
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MotherAdelaide de Roucy (>1014-1062) [S756] [S905]
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SpouseGeoffrey de Châteaudun II, Count of Perche and Mortagne (e1048-1100) 
Child +Margaret de Perche, Countess of Warwick (e1064-) [S756] [S905]
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Child +Juliana de Perche (e1069-) [S756] [S905]
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Child +Mathilde de Perche (e1081-1143) [S905]
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Attributes
ClaimDetailEvidence
GenderFemale
NameBeatrix de Ramerupt [S905] [S955]
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NameBeatrix de Montdidier [S756]
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NameBeatrix [S756]
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NameBeatrix de Roucy [S905]
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FatherHildouin de Ramerupt IV, Count of Montdidier (e1010-~1063) [S756] [S905]
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MotherAdelaide de Roucy (>1014-1062) [S756] [S905]
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Timeline
ClaimDateDetailAgeEvidence
Birthest 1049 (1049-1053)
 
Living1129 [S905] [S955]
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Sources
IndexTitle
[S756] Weis, Frederick Lewis, "Ancestral Roots of Sixty Colonists Who Came To New England before 1700, 7th Ed." (Genealogical Publishing Co., Inc., Baltimore, 1999).
[S905] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Normandy: Alencon, Evereux, Meulan, Perche)" (2006-7 (v1.1 Updated 02 March 2007)) (https://fmg.ac/Projects/MedLands/NORMANDY NOBILITY.htm).
[S955] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Champagne Nobility)" (2006-7 (v1.2 Updated 06 July 2007)) (https://fmg.ac/Projects/MedLands/CHAMPAGNE NOBILITY.htm).