Despite Patch 5 it seems for quite a few of us can't get Minthara at Moonrise despite knocking her unconscious in Act 1 instead of killing her.
Which is a shame, I was really looking forward to having her in this playthrough and there was no way of me knowing it was bugged until hours of gameplay later.
I hope this can be fixed, and I'll just be taking a break until it is, because it's really demoralizing to have to go back so far just to hope this encounter doesn't get bugged again. It'd be different if the content was close in nature but that's such a long ways back...
