When I generally get Marble into my camp, I'll first get addicted to her milk and then plan on spending the next few game days at the farm talking to Marble. Pretty much do nothing but got to the farm and talk. If I get a scene for handling withdrawal, then I'll perform whatever action makes her attitude towards me the best, but doesn't increase my addiction (helping at farm, (1) For Marble, (2) For Milk, (3) Refuse... Pick For Marble, and don't drink the milk when she gives it to me.
One critical thing you'll see is that when Marble offers you the ability to drink straight from her breasts, that means she's quite affectionate towards you. But don't drink. The next few encounters will indicate her affection towards you is lowered, but keep on talking and it will rise until she once again offers the ability to drink straight from the breasts.
In a nutshell.
1. While handling the withdraw NEVER DRINK ANY MILK UNDER ANY CIRCUMSTANCE.
2. Visit Marble and talk A LOT.
3. When given a choice of actions, always pick the action that strokes Marble's ego the most provided it doesn't involve you drinking milk.