https://mangadex.org/chapter/37b8285c-18ef-4c2d-86ed-c4d95a2a0f4f/5
In this page, she seems to have knowledge about the inhabitants of the dungeon, whether that's knowledge from prior to her sealing, or during her time sealed up, I don't know.
https://mangadex.org/chapter/37b8285c-18ef-4c2d-86ed-c4d95a2a0f4f/27
She gave the save & Reset skill to everyone that entered the dungeon, hoping for someone to set her free, given that she knows how the skill works, and how she gave it to everyone, it makes sense that she'd be able to figure out that Kiska hadn't met her for the first time here:
https://mangadex.org/chapter/a7eee95d-d29d-4b19-b4fd-603d329647d2/15
Apparently, doing something bad towards Ageha leaves a bad scent around him.
Judging from the first, and the second time he released her, it wouldn't be a stretch of the imagination to assume she has multiple personality disorder, one that is all sweet and cuddly, and the other that's all, well, whatever it needs to be to protect that sweet and cuddly personality.
https://mangadex.org/chapter/dc99a105-bb5f-4dd2-9f3d-99823755b887/42
Going back even further than the top link, I noticed that there's a foggy, ghost-like distortion of Ageha when she sees Kiska about to die, yelling for help, she then comes into full view, indicating that she's capable of traveling the dungeon in an astral projecting kind of way of sorts.