The vanilla game has a bug that excludes intimacy unlocks during quests. The Bugfix mod addresses this https://itch.io/t/1167355/bugfix-for-10d-v6b, but it will not undo the contradiction. The in-game fixes are to either use a save or an auto-save to revert to just before the sex scene (with the Bugfix mod) or use the Oblivion Potion on her to reset her level-up requirements. Otherwise you could edit the save file to reset the intimacy lock so that you can unlock it again in a meet interaction. You should make a backup of the file first as it is difficult to fix mistakes and use a decent text editor(anything better than Windows Notepad) to open the file. The file uses the JSON format so an online JSON editor can be useful for looking through the data. Once you find the slave, change the "consent" attribute from true to false.