You are not obligated to claim her profit as your income - unless you are living in the community state. If you are domiciled in one of the following community property states:
Following rules apply:
Wages, earnings, and profits. A spouse's wages, earnings, and net profits from a sole proprietorship are community income and must be evenly split.
Dividends, interest, and rents. Dividends, interest, and rents from community property are community income and must be evenly split. Dividends, interest, and rents from separate property are characterized differently.
Let me know if you need any help.