I think the most important aspect of losing an accent is having the desire to do so, it has to be a priority and does take some effort for most people. There are those who have the ear and facility with language to do so fairly easily, but most have to work at it, and they usually don’t, if they speak well enough to understand and be understood, that’s as far as it goes.
If he wins, she will probably get more intensive language coaching. Up to now, her public life as a has been focused on her model beauty; but she also seems to have a lot of intelligence and poise. Although he obviously likes the outwardly beautiful types, I think he would be fatally bored in marriage to a woman who was not intelligent. I got the impression Ivana was very intelligent, and certainly her kids are. I don’t know much about Marla except that she is gorgeous, but she didn’t strike me as all that bright.