In TGS Bair and Sorilea examine Semirhage, and the remark on what one of the Shadowsouled looks like. They circle her and voice their opinions on how she looks and speaks.

It's strange that Bair didn't recognise Semirhage. Earlier in the series, Amys says that they have seen the Forsaken walking Tel'aran'rhiod, including some of the males. While it's possible that Amys and friends only saw a few of the Forsaken, Birgitte says that all of them have been stalking one another in the World of Dreams, except for Aginor and Balthamel (who were dead).

I would have expected Bair to recognise Semirhage.