Trenugs, does she spend your money or "her" money?
You should know by now if most women are left financially to fend for themselves, they usually end up starving to death. So if it's your money, do something "by accident" like saying "oh honey, guess what, i accidentally signed me up for this money market account and they require a (insert amount of money she stupidly spends every month) deposit every month. ha ha, i'm so silly!"
i don't know man, i just called the fiancee and she's out shopping for a new outfit so we can go out to dinner with her married couple friends and her sister and brother. and i'm like why , that's such a waste of money and she goes "um, you spent 4 times as much money on clothes as me since we met". now i could've said "yeah, well carhartt work jeans don't really count and i make 7 times more than you " and she'd cry, or i could've bowed my head and said "you're right, ha ha, have fun". guess what i opted for?