I think there's a very good chance they will ask her what I do for a living. In which case she would need to tell them about my new employer.
If that happens, would an updated I-864 showing my new employer's name, paystubs, verification letter, and W2 be enough?
For transparency, the Verification Letter from my employer states that I make a base salary of $30,000 plus commission with expected annual earnings of approximately $65,000.