She hasn't made mention to either of her partners that the volatile essence and subsequent overuse of her abundance of aether prior to Endwalker has potentially shortened her lifespan. While she expelled the majority of excess light aether she accumulated on the First, it had permanently altered her physiology enough to now have what is akin to permanent Light Aether sickness. The illness would, after a time, slow the pace of her heart and brain, manifesting symptoms comparable to Alzheimers.

Y'shtola is smart enough to have pieced things together, but at present time, hasn't brought the problem up. She figures Jae'si will speak on it when ready, and would just like to spend her current days happy with her family. Part of her motivation for researching universal shard travel is to research the latent Aether on the First more carefully in order to produce a cure.