If your wife has a single member LLC, she will just need to file a schedule C (Self-employment) with your married filing jointly tax return.
If she does not have a single member LLC then she needs file a partnership or corporate tax return separate from your personal taxes. Please see attached for more information.
https://turbotax.intuit.com/tax-tips/small-business-taxes/llc-tax-filing-rules/L39E29kPR
