While I’m on this Latin kick, a phrase for all occasions:
idem dixit illa
Literally,
She said the same.
Key here are (1) the final position of the subject (for emphasis), (2) the demonstrative pronoun illa instead of the personal ea, and, of course, (3) the unambiguity of the subject’s gender: idem dixit is grammatical but lacks that vital specificity. Use ille to mark male utterances.

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