Always.... let her have everything she wants and then she has no room to complain! I have a project list and rite next to it is the Honey Did list. The project list are the things I want to do / purchase. The Honey Did list is exactly that.
There is NEVER an argument in my house when it comes time for me to do / get what I want. Ican reminf my wife at any given moment of her items.
It's worked for me for 32 years.......