In one paragraph, Deppian is referred to as Countess, two paragraphs later, as Lord. Another small mistake by Brust the translator? (PotD, pg 133 paragraphs 2 and 4)
This question was addressed to SKZB on the Dragaera Mailing List some time back. His response indicated that these were two discrete characters, and that both Lord and Lady Deppian were present at the meeting with Kâna.