– First of all, you want to make money out of this quest, so set a budget for yourself. I think 5,000 np is reasonable, since her paybacks are rarely a lot more than that.
– If you think that her quest items are too hard to get, then DO NOT go and get them, she will not hurt you in anyway. Just wait until the time is up for the quest, go back, reload the page and do another quest.
– I always try to do 1-5 quests per day. Therefore, I have stored in my Safety Deposit Box 50 or so chocolates. I know people tell you not to keep expensive things in your deposit box, but buy chocolates directly from the chocolate factory and store about 1-2 of each type in your deposit box. Trust me, if you want to do a lot of Snow faerie quests, in the end, it will pay off.