Get your taxes done using TurboTax

I hate to say, "unravel the spools", but you do need an accurate way to value your inventory.  For the future I would suggest your wife develop a simple way to track her ribbon usage.  If she uses the same amount of ribbon for each bow she could simply use tick marks on the ribbon package.  If the amount varies from bow to bow a log sheet might be easier.  It doesn't need to be complicated.