"She was probably mentally ill to start with."
I'm no shrink, but I'm gonna guess that the mental illness she suffered from was rank stupidity.
Liberalism is a disease.
Yes, rank stupidity and more.
Western women that marry Muslim men tend to have been rejected by Daddy and are looking for strong, macho, almost misogynist types. The gals are willing to accept being controlled and dominated for love.
The Muslim men think that the white gal is a whore but since he moved to Europe or the US, white gals have been his desire so he marries her anyway.
Once the marriage matures the Muslim stops respecting her, and she comes to regret things later when she grows up a bit more (maybe reach 30 or 35) and realizes that her husband is close to a monster.
The ones that don't come to that realization become converts.
But if the husband still doesn't respect her after he conversion, then he is very willing to encourage her to become suicide bomber fodder.
Betcha $100 that the Belgian's Muslim husband is still alive.