Tried the new update, Carla is still getting stuck on 5 affection, and from that point on her meals don't reduce hunger even though it says they do. Obviously I'm doing something out of order. Should I complete the first Fina quest (find her at the waterfall) and only then start buying meals? Or maybe buying several meals the same days breaks her progression?
EDIT: So, after some testing I think I cracked it. You need to go chat to Carla so she gives you the Fina quest. Go to the waterfall in the evening to peak on Fina. You should wait to have the hunger status to buy lunch from Carla (bread icon in next yo Krowley's portrait in the menu). After buying 5 lunches you should be at +5 affection with Carla. Come back on a Tuesday and/or Wednesday night and go to the basement of the inn. You should find her awake and eager to please. The lunch of the next day should be free, but you won't rest that night. Just keep fucking her and getting +3 affection until you reach +15, afterwards she will agree to give you titjobs during the say (flirt option).
Somebody mentioned that you may need to buy lunch during the day to be able to fuck at night, I'm not quite sure if it's the case. I also had the option to wake her up when she was sleeping, but she refused and went back to sleep, maybe someone knows more about that.