I have a very bad news for Melenia if she thinks she can take anything from Trump. Dude made himself knowingly look as poor as it gets and paid only 750 dollars in taxes, do you really think she can take anything from him when he can do accounting hacks as much as he wants and make it look like he owns absolutely nothing that could be given to her? She would take nothing but maybe a tiny amount that is nothing compared to what Trump claims he owns.
You are forgetting the fact that Trump is probably at his weakest right now thanks to his loss and this is a great time to strike him which Melania was probably waiting for quite sometime. Even the toughest humans break when they are at their weakest.
Trump is no exception. She probably has been preparing for this scenario for quite sometime. Under-estimating her is silly. Trump also has to deal with many court cases once his presidency is officially over.