My conclusion would be that "quam", not "quem", is certainly the correct feminine accusative singular relative pronoun.
Is Quam a relative pronoun?
Quam is an accusative singular feminine relative pronoun that refers to fēmina. It is singular and feminine because fēmina is singular and feminine.
What case is Quem?
Quem = accusative masculine.
What is accusative relative pronoun?
Relative pronouns in the accusative case are objects of the verb. The accusative case of 'who' is 'whom'. 'Which', 'that' and 'what' has the same form in the nominative and accusative case. Eg: The woman boy whom you taught is now a doctor. The house which my father built is on the next street.