I was in the same position, explored the whole of old town etc. so too much time passed to return to the lift.
I ended up killing some of the people to get to the boat in the undercroft to leave the area. This obviously meant they were hostile to me when i came back for this goods and services quest.
What I did was take my best stealth character (only 5 so it can easily be done), sneak past the guards in the courtyard area and go to the top of the stairs, there are like 5 guards at the top of the stairs (guarding the path to Morena) so its impossible to sneak past, with my sneak level anyway, so i threw some firecrackers which they all walked towards and then i walked straight up to Morena while still in sneak, hit space to pause, unstealthed and clicked to speak to her.
Then when you are done talking to her so the quest has updated they are still hostile and will attack you, so use a potion of invisibilty which gives you enough time to run out of the area and leave, free to carry on with the quest.
I guess when I come back to hand the quest to her I will have to repeat this process to turn it in.
Im guessing you can also just kill all the guards and then walk off leaving Morena alive so you can then walk back in stealthed, pause the game, unstealth and talk to her, then use the invis potion meaning you can circumvent having to sneak past everyone and use firecrackers.