So, I only have 2 main quests left: Final Preparations and The Great Escape. When I go to Oxenfurt as directed, there is no Yennefer. Any help is appreciated.

I had that bug once and fixed it by reloading to an earlier point and starting the quest again.

Yea, mine probably is a good six to eight hours of gameplay back. Including High Stakes, which I do not want to have to battle Sasha again like 10-15 times in Gwent. So, hoping they know about it and patch it soon? Hopefully?