If you are doing work for her LLC, then yes, you are sub-contractor and should receive a 1099 from her LLC.  This means you are also self-employed and have to file your own Schedule C for your income.  She would issue you a 1099, claim the expense on her Schedule C and you claim that income on your Schedule C.  Check out this discussion on a similar situation as they cover different scenarios.  Single Member LLC w/ Employee or Subcontractor Spouse

Thank you. I was going down the same path. I'll have a look at the discussion. 

If you were paid over $600 for the calendar year doing work for the LLC, then yes, your spouse would issue you a 1099 (which is an expense to the business and income to you). You would file a Schedule C for the business (reporting all income and expenses), and then a Schedule C for your 1099 (reporting all income and expenses).