One thing I've learned from reading all these dungeon titles - if it's said that "a rogue, powerful monster wouldn't be here, but X floors above/below", that means it's absolutely going to show up and start wreaking havoc on floors where lower-tier adventurers think they're safe.
That said - Kachua already has rumors swirling about her, which I fully expected to be the case and am surprised that she seemed so surprised at that outcome to her shenanigans. I like that she didn't immediately go "let's go hunt down that Ant Queen!" and instead prioritized the safety of her party members - very on-theme Mom Move, even if it ultimately didn't work out for them here.
Also - I guess it makes sense, but it's kind of neat that those partied with her can make use/benefit from her special skill's tangential features - like the rare drop increase buff that coincides with the "flyer"; the items aren't only for her use, but anyone with her or that she passes them off to.
Which fits nice in a thematic sense into her "caregiver mom" role, of not hording things but giving out help and supplies to those that need them.
Thanks for your continued work on this series.