I was wondering the same thing in a Discord just a bit earlier xD
That time-bubble really is the problem here. Are we talking one year pre-calamity for her death? Shortly before the calamity? Or even after the calamity? Did the bubble get expanded, or are we still within one year after the calamity, which wouldn't make any sense? There are, for me, at least three possible points in time when she could have died, and I guess we will never know unless the def team tells us.

Personally I favor a time shortly after the calamity, since I think time-bubbles are bs, to put it frankly. Thus, 1.x characters still knew the real Yda, while 2.0 players never really met her. However, if you rp, you can rp whatever you want, that you knew her, that you didn't, etc. As always in this game.