[JAS84]

You can understand the mix-up - two female companions at the same time is unheard of in the modern era. Eccleston and Tennant both had one woman and one man at most (Rose/Jack, Rose/Mickey), same for Smith (Amy/Rory), and Capaldi (Bill/Nardole), while Whittaker's Doctor had one woman and two men (Yaz/Ryan/Graham), though of course was a woman herself. The last time there was two female companions together in the TARDIS, not counting the big DW/SJA/Torchwood team up at the end of Tennant's third season, was Nyssa and Tegan, when Peter Davison was the Doctor! That's over 40 years ago.