I see a lot of people in the comments reacting to these sad stories about the deaths of her comrades, saying how "this is why I would never want to be immortal" and the like. However, I think it's trying to push the opposite narrative. In stories with long-living or immortal beings, you usually get the message that life is meaningless and their inability to form close bonds but here they're showing the other side of the coin. You have a very long time to learn new things, experience new sights, witness the changing of eras and make new friends. Even if those friends die, they become parts of your memory that you can carry on, even when nobody else remembers them. It's a melancholic, yet happy thought.