Commentary
Weis lists her as the daughter of Rotrou II and granddaughter of Geoffrey II and Beatrix. It is evident by the line numbers (24, 24A, 25) that Weis added the generation as an addendum to his original work. Weis lists her date of birth as 1105, and since Geoffrey II died in 1100, he could not be her father (if the birth date is correct). Weis lists CP XI App D 112 as a reference. CP does not mention Matilda de Perche. However in the same reference on page 113, it states that Rotrou's wife "Maud was drowned in the wreck of the White Ship, 25 Nov 1120 leaving 2 daughters.(d)". The footnote lists these two daughters as Philippe and Felicie - Matilda is not listed as a daughter of Rotrou and Matilda (Maud).

She married 2nd, Gui de las Tours
Family
ClaimDetailEvidence
FatherGeoffrey de Châteaudun II, Count of Perche and Mortagne (e1048-1100) [S905]
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MotherBeatrix de Ramerupt (e1049-) [S905]
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Spouse 1stRaymond de Turenne I, Viscount of Turenne (e1076-~1122) 
Child +Marguerite de Turenne (e1121-) [S756] [S903] [S904]
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Attributes
ClaimDetailEvidence
GenderFemale
NameMathilde de Perche [S756]
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NameMaude de Perche [S756]
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NameMathilde du Perche [S903] [S904] [S905]
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FatherGeoffrey de Châteaudun II, Count of Perche and Mortagne (e1048-1100) [S905]
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MotherBeatrix de Ramerupt (e1049-) [S905]
research
Timeline
ClaimDateDetailAgeEvidence
Birthest 1081 (1081-1089)
 
Birth1105France
her father died in 1100
negative
Death1143 [S756]
research
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).
[S903] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Aquitaine Nobility)" (2006-7 (v1.4 Updated 18 July 2007)) (https://fmg.ac/Projects/MedLands/AQUITAINE NOBILITY.htm).
[S904] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Angouleme)" (2006-7 (v1.4 Updated 18 July 2007)) (https://fmg.ac/Projects/MedLands/ANGOULEME.htm).
[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).