So as I was re-reading oathbringer I noticed some weird stuff about Jasnah.
From this I'm thinking that while Jasnah was still young (maybe 3-4 because Navini said somewhere that when she was really young she was already super smart--also remember that a year there is around 500 days so a 4 year old there would be roughly 6 here) she bonded Ivory, probably only saying the first ideal. Gavilar noticed and that's what got him started with the whole 'bringing back honor and radiants' stuff. Someone else noticed, maybe Navini and thought she was crazy, so she put her in the asylum. But I'm a little confused why nobody would remember it. Seems like something people would remember.
Tell me what you guys think about it. And yes I know that this will probably all be answered in Jasnah's book, but that's still like 8 years off.