I don't see her committing suicide in the bunker once the elites call in the debts of their little puppet. Trump depends on the perception that he's a winner in order to keep on rolling (much like Hitler, whose political philosophy he shares in large measure). When the Trump Train finally sputters to a stop, the creditors will want what's left of him, and there will be no more fools left to fleece.
So what's her out? What's her angle?
Some possibilities:
1. Bail before his net worth deteriorates to a level that would prevent him from paying off on the prenup
2. Wait 10 years, when she'll be about the age Trump loses interest in women and dumps them, possibly getting a better payoff under the terms of the prenup
3. Stay on as guardian of the Trump name after he implodes, milking the role of the loyal widow. Maybe serve as head docent at the Donald Trump Museum and Interpretive Center in Kiowa, Kansas, giving insight into the fetish items displayed, like the pistol and ruptured cyanide capsule he used in his final moments
4. Bail as soon as it's not totally obvious that she's doing it because he's gone full retard jack-booted riding crop fascist, and find someone in Manhattan with real money
Melania will violate her prenup by failing to immolate herself on Trumpligula's funeral pyre.
She will make up the megabucks by writing a complete expose on her life with Trumpligula, including that he had merely a half of an undescended testicle, less than the one testicle of Hitler, and not even flapping in the jockeys.