Mmm... interesting, this quest must be done at daytime. And you have to talk to the girl, maybe you're too close to the guards, try changing your position and angle so the girl will be between you and the guards. You need to talk to her. If you still can't let us know and we will help you to complete the quests.
Also, you can direct message me at our Discord channel. I'm jptester and all comments are welcome, I will personally answer any quest you have.
Thank you for playing our game.