She's leaving for good, but AITA for telling my friends and partner they're not the most important?

When an amazing study abroad opportunity presented itself to an 18-year-old girl, she couldn't be happier. However, her friends and partner didn't share the same excitement. They were concerned about the danger of going alone and the fact that she would be practically burning bridges with them. Even though she tried to assure them that they could still be friends and she promised to visit often, they continued to be unsupportive. Fed up with their constant nagging, she finally told them that they weren't the most important thing in her life and that this was the future she had always dreamed of. This resulted in her partner breaking up with her and her friends ghosting her. While she acknowledges that she could have phrased it better, she also knows that she did what was best for herself. Some of her cousins think she went too far, but her mom thinks she should just board the plane and never spare them another thought. What do you think? Share your opinions and advice in the comments below.