She is voiced by Katie McGuiness.
In 1267 Keira was serving as King Foltest's advisor when she and other mages in the North learned some of their fellow mages were planning to betray the Brotherhood of Sorcerers for Nilfgaard. Armed with this information, a conclave was called on Thanedd Island under the pretense of figuring out what they should do in regards to their positions as advisors to various rulers. In reality, Keira along with several others, including Philippa Eilhart and Sabrina Glevissig, planned a coup of their own to try and prevent the Nilfgaard supporters from putting their coup into play first.
When she attended the banquet the night before the conclave, she met Geralt, who'd been brought along by Yennefer, and the two conversed for a bit, with the witcher joking that he had created the caviar illusion and her noting she didn't want to drink as she planned "to get pregnant tonight" before Marti Södergren butted in and the trio discussed trivial matters before Keira walked off to talk with other mages there.