You don't get to hold the manner in which you mutually managed your estate against her in divorce. You can try to convince the court that she should seek a higher-paying job, or that a higher income should be imputed to her within the context of any request for spousal support, but we're not in a position to assess your impression that she could earn more money or the availability of higher-paying jobs within her field and the scope of her skill and experience.

A FL-142 is what it is. If she completes the FL-142, then she's likely to have a difficult time disputing the information she reports during any subsequent legal proceedings. But if you are asking what will happen if you get her to sign off on a document that you know understates the value of the marital estate, don't count on it holding up when she attempts to refute incorrect figures with more accurate figures.