I'm going to assume that this 3,000 buckaroos came from joint money - in which case, you certainly should not be ignoring the problem. Doing whatever she wants, even after hearing your objections (assuming they are valid, which seems to be the case) is really rude and inconsiderate. :(
I also agree with getting a spreadsheet set up - you don't want trouble with the IRS especially if you file jointly because then it's your problem, too. Perhaps you can bargain with her - "honey, you can try your hand at this for x months, putting x amount more money into it, and if you don't make x amount of it back (not counting sales to family and friends, because they'll get tired of buying from her) you need to shelve this project." Encourage her to get books on spreadsheets or web design if she doesn't know how to use excel or make a webpage, and books on how to run a business. This sounds like an amway type project, where she doesn't actually MAKE the jewelry, but perhaps she can try to sell some stuff at a flea market or craft fair?
You may need to take a look at how your money is allotted, as well. Does she work? If she doesn't, how is it figured how much money she has to spend? She should not have complete free reign over the money. Allowance is a crude word for adults, but that's essentially what it is. She can't spend whatever she wants whenever she wants. If she does work, does she have a certain percentage of her income that goes towards paying debt/bills, a certain percentage that goes into savings, a certain percentage that goes into an IRA, and some left over for fun stuff? If this is the scenario, she needs to only be using her "fun stuff" money for this. Even if you are the only one who pays the bills, you need to sit down with her and go over the numbers. Point out exactly why dropping 3 grand is worrisome to you.
I absolutely do NOT believe the wife is always right, nor "her money is her money, and my money is her money." Some people are just idiots with money, and will never get it, no matter how many times you show them graphs and spreadsheets. Not entirely their fault, but keep them as far away from the finances as possible.. those are the people that end up in debt up to their eyeballs!:whacky: This is an important topic you both need to discuss, perhaps with a financial adviser. Money issues are a HUGE reason for divorce/unhappy marriages. :eek: