You can’t go through something like that and come out the other side unchanged. She is a different person now," an insider tells PEOPLE in this week's issue

You can’t go through something like that and come out the other side unchanged,” an insider tells PEOPLE of the Princess of Wales

Kate Middleton spent most of the year battling cancer, but the Princess of Wales is slowly returning to royal duties after months of living under the radar. “You can’t go through something like that and come out the other side unchanged,