The Hestia Familia could really use Ryuu since she's an experienced adventurer who has prior experience of the deeper floors. Of course Bell as well now has experience of some of them, but it wasn't a normal excursion, it was an accident to flee for his life. If they had Ryuu, they could actually properly prepare and advance by maximising safety and efficiency. Ryuu is so comfortable in the dungeon that her real talents are totally wasted by only working at the inn. The inn proprietress herself should realise that. I really hope she would join the Hestia familia directly, but at the very least she should join their dungeon trips. And have Hestia check her status if nobody else is going to do it. Hestia would be her usual jealous self due to one more woman hanging around Bell, but on the other hand Hestia loves her whole familia and thus wouldn't reject someone who would be a huge asset in keeping her familia safe in the dungeon.