Commentary
She may be the daughter of either of Hugh Capet's 2nd wife, Eadhild or his 3rd wife, Hedwig of Germany.

Charles Cawley: 'There is no proof of the identity of the mother of Beatrix, although it is unlikely that she was the daughter of her father's first wife given the date of her marriage.'
Family
ClaimDetailEvidence
FatherHugh Magnus, Duke of France (~898-956) [S957]
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SpouseFrédéric I, Duke of Upper Lorraine (~910-978) 
Child +Thierry I Duke of Upper Lotharingia (~962-1027) [S957]
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Attributes
ClaimDetailEvidence
GenderFemale
NameBeatrix de France [S957]
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NameBeatrix [S2727]
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FatherHugh Magnus, Duke of France (~898-956) [S957]
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BrotherHugh Capet, King of France (~941-996) [S957]
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Timeline
ClaimDateDetailAgeEvidence
Birthabt 938/39France [S957]
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Betrothal951 [S957] [S2727]
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Marriage[Sep 10/Nov 12] 954Frédéric I, Duke of Upper Lorraine (~910-978) [S957] [S2727]
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DeathSep 23, 1003 [S957] [S2727]
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Sources
IndexTitle
[S957] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - Lotharingia)" (2006-7 (v1.1 Updated 04 September 2006)) (https://fmg.ac/Projects/MedLands/LOTHARINGIA.htm).
[S2727] Cawley, Charles, "Foundation of Medieval Genealogy (Medieval Lands - France, Capetian Kings)" (v4.3 Updated 07 January 2020) (https://fmg.ac/Projects/MedLands/CAPET.htm).
Kinship Lines for Beatrix de France
Spouse/PartnerDegreeRelationshipMRCA
Frédéric I, Duke of Upper Lorraine (~910-978)135th Cousin 1x removedCharles I, King of France & Italy (748-814)
Frédéric I, Duke of Upper Lorraine (~910-978)135th Cousin 1x removedHildegarde (~758-783)