Cata Fang of the Father Legendary

Hey guys, not sure if anyone out there is doing this quest line now but I have started it recently and am only on the second quest where I need to find Corastrasza in Twilight Highlands. However when i get there she is not there. I have looked at videos and yes, i am where i should be. It feels like a bug. I dont know if there is a setting i have to do since the content is so old or what. Any ideas ? lol Thanks!

I have same issue, submitted bug report had 9 different GM tell me different issues and resolve probabilities yet still cant get her to spawn to finish quest.