She's also had to support her husband, Patriots quarterback Tom Brady as he dealt with the surprise reinstatement of his NFL suspension Monday.
But Bündchen, 35, says she chooses not to let the tough times get to her.
"I have had challenging experiences in my life, but I also had joy and wonderful experiences," she says in a new interview with PEOPLE on stands Friday. "I don't like to focus on things that don't make me happy and that I can't change," she says. "I'd rather try my best to learn from it and move on."
Mark Seelen / Taschen
"No one ever said learning was to be easy, but it's part of the process of evolving as a human being and we all have to go through it," she says. "When I look back, I see that each difficult time brought an important lesson. And I prefer to look at it with gratitude because I wouldn't be who I am today if I haven't gone though it all."
Luiz Rampelotto / Pacific Press / LightRocket via Getty Images
"She's being a supportive wife, just like anybody whose husband would be going through something like this," a source close to Bündchen told PEOPLE. "They're surprisingly pretty simple people and very down to earth. Family is first on all fronts."