I would like to reread a fantastic novel (actually a trilogy).
The Earth is dying consumed by war and eco problems. Some people live wealthy in orbital stations. That's where the main character lives, but she decides to go to the planet for some time to study at university. But the war breaks out, and she can't return to space (Book I).
The dystopia is here, and she spends years trying to return home, including fighting with cannibals and other "adventures" (Book II).
Once at home, the colonies star a trip to a far away planet. When they arrive, the woman is an old woman who can hardly stand up. But in the end, she fulfils their dreams after all (Book III).