Just go back to your shed and close the door, the pain will go away slowly.
Good plan. Be careful, do you really want her to look more closely at kite/sail/board/beer expenditure. Even better, tell her how awesome she looks and get something for the money.
Many hairdressers have specials just like supermarkets do. Tell her you don't like her current hairdresser's skills; find a cheap one and recommend it to her, then tell her how much better her hair is than before.
Some guy online was having fights with his housewife's excessive spending on clothes and other crap. So he got her a job delivering catalogues during school hours. It got her fit from all that walking, busy to keep her away from the shops and cafes, and the extra money she made helped pay for her shopping hobby. Delivering catalogues 2 days a week for about 2 hours each time would make her about $30-80 a week.