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Might be a bit too much headcanon but I think she just doesn't feel like Alola needs a Royal sovereign anymore and is content with being a Captain/E4. Or her line was old name but poor in money in recent days, maybe her father was the one who tried to put the Mart that got wrecked by the ghosts and thus lost their last capital around, prompting a sharp decline in health and his death.
She's still a good girl and deserves a happy life.
