If Serenas dialog "Come with me" is missing when she's waiting somewhere -
here's the fix:
Unlike followers from the vanilla game, Serana's dialogue does not check the normal follower quest, but certain quest variables in the quest "DLC1NPCMentalModel".
You can take a look at your Quest variables with the console command "sqv DLC1NPCMentalModel".
The following conditions must be met, for her to be available as a follower: CanFollow_var = True / IsFollowing_var = False / IsWaiting_var = True / TurnOffComeWithMe_var = False / LockedIn_var = False
In my case the glitch was triggered by the LockedIn_var being set to True.
You can change the variable by typing "setpqv DLC1NPCMentalModel LockedIn_var False".
You should check all 5 variables in your game, by scrolling through the console with the Up- and Down-Arrow keys.
here's the fix:
Unlike followers from the vanilla game, Serana's dialogue does not check the normal follower quest, but certain quest variables in the quest "DLC1NPCMentalModel".
You can take a look at your Quest variables with the console command "sqv DLC1NPCMentalModel".
The following conditions must be met, for her to be available as a follower: CanFollow_var = True / IsFollowing_var = False / IsWaiting_var = True / TurnOffComeWithMe_var = False / LockedIn_var = False
In my case the glitch was triggered by the LockedIn_var being set to True.
You can change the variable by typing "setpqv DLC1NPCMentalModel LockedIn_var False".
You should check all 5 variables in your game, by scrolling through the console with the Up- and Down-Arrow keys.