I understand your feelings OP because when I heard that we are going to Tural to help with finding the new ruler I was not really happy. Unlike for you this patch has decreased my fear about it since it was stated that we are not 100% behind her and will check out the situation in Tural for ourselves. So I would take a guess and say that our character would back out of helping her if we found out that she was a bad guy.

Honestly I envy Estinien. Our character is called a adventurer again but somehow needs to be pushed to go to other countries. I would have enjoyed it a bit more if we simply checked up on Vrtra and his sister, meet Estinien there and decided to travel with him to new lands. This could have given us a chance to explore Tural free from any expectations. Any kind of choice about the next ruler could have come later in the story.