Good evening Kevin - I see you are on one of the down side of your roller coaster ride. But in DBing you know that it does go back up. However, while you are on the down swing it is important to not make any decisions that you might later regret.
As to your not giving any more money, letting her use the truck, etc. - that might not be a bad idea. She does need to know what it will be like w/o you around. In the meantime, keep dbing, enjoy the little positives and come to the board for support when you are down. This board and my many friends here have helped me over many, many of my low points of my roller coaster ride and I have made many decisions while I was down, (I just didn't act on those decisions and then later recanted them when I started back up again)