TT #39 · Parshas Tazria · Aliyah 1 · Passuk 5
English: If she bears a female, she shall be impure two weeks as during her menstruation, and she shall remain in a state of blood purification for sixty-six days.
Chabad.org — Chumash, English translation + Rashi for Vayikra 12:5
Torah Temimah cites Zevachim 38a.
E-Daf — Zevachim 38a · Shas.org — Zevachim 38a · Vayedaber — vowelized Zevachim 38a
English: That case is different, because it is written “as in her menstrual impurity.”
Textual comparison
The phrase “as in her menstrual impurity” rules out the proposed inference that both the written form and received reading determine the period.