I'm really wondering what they're leading to with that ending.
One thing I'm confused on (SPOILERS to follow, if that's a necessary warning at this point): The medical kit (nanobots?) will just keep repairing her. People "grow old" by their cells decaying, so she wouldn't grow old (effectively being sort of immortal), I get that. But wouldn't she still be able to age to adulthood? I wouldn't think the medical kit would attack healthy new cells being created in her body, keeping her forever young.