She's No Early Bird
How to Get: Talk to Vesna in the Inn, to trigger her leaving at night, after 2000.
How to Complete: After 2015, if you approach the outside of the Inn, you'll get a cutscene where she's being harassed by several unsavory men. After killing her accosters, you have the option to escort her home. If you don't, she'll die. There are several methods to get her home alive:
1) Take the shortest path, fighting barghests along the way. It is difficult to keep her alive, because she pulls more aggro than you do. But you can enter a hut, and when you exit, she'll be at full health.
2) Drowners don't appear until 2100, so you can avoid the barghests by taking the longer, northern path.
3) Go back inside the Inn's courtyard and meditate until dawn. Vesna stays with you the whole time, and there are no monsters to fight during the day.
4) Just run all the way to the village. Enemies won't chase you very far, and Vesna will catch up eventually.
Regardless of how you get her home, she'll offer to meet you at the Mill for a reward. She'll be there between 1930 and 2300, so meditate until then. Bring some form of Wine. If she won't talk to you, meditate for another day.