Ivana has kept an invisible profile since the campaign started, cozie. I can't decide if it's because she's still financially tied/dependent on him, if her kids have applied undue pressure on her, or if it's just that she feels much more 'European' than 'American' and so doesn't care enough to be directly involved.
Personally, I think it's her kids. They're all enjoying and benefiting from this and I have a feeling they're all ruthless enough to have said "If you say one thing, we will cut you out of your grandchildren's lives like a cancer".
I've always rather liked Ivana. Spoilt socialite, to be sure, but she's always seemed to be as much of her own person as she could be.