She's probably the original blonde Freya somehow, like maybe she was kidnapped and assumed dead by royalty, so when they erased her family's memory from everyone, hers was taken too. Maybe she was also changed by dark magic to have a different appearance
Comment by molly cavenaile on Villain Family's Strongest Butler - Chapter 20
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@molly cavenaile i also think when they “erased” her family her memories went with it.. as wellas the crown prince of the other kingdom used dark magic to retrieve her soul as a way to get back at the grand duke.. however when she fell into the dark magic on the battlefield it undid whatever was done which is why her soul is back in its original body