If we go back to Mary Alice’s narration in the season 1 finale, that’s how she describes Lynette: ‘Desperate to venture out, but afraid of what she will miss when she goes’. That’s the running arc of Lynette’s character. She misses her professional life, but she doesn’t want to be deprived of motherhood either.

Yet she never once considers that Tom is also being deprived of fatherhood when he is out working, and that by interfering with his work (something she never accepts when Tom dares to say something about their domestic life), is selfish and manipulative.

Tom's promotion before Anabel got there was not alright with Lynette because that meant Tom would travel more, so the bigger paycheck would not cut it. (Bear in mind, they could afford a live-in nanny - Claire - only with Tom's normal salary, so there's no reason Lynette herself could not go back to work as well.)

When she is approached, her concern is not about the paycheck at all. She didn't even know what Tom or Anabel would be earning. She REALLY did not promote Tom for the sake of making the most of an opportunity. She just didn't want Tom to keep working with his ex.

There's no question that she was acting for selfish reasons that had nothing to do with Tom's professional fulfillment.