In fact, I have a special secret ending prepared for her. As for her return, I don't really have plans for that. It's more or less a nice ending to their relationship, except that she deserves more build-up. Because at this point there's some spark in their relationship with the protagonist and it's pretty clear (Stockholm syndrome, lol), but I want to stretch that out somehow later, add some quest where she can hang out with protagonist and develop her persona a bit more.
Mmm, are you sure there's missing files in the latest version? Because I checked it and the Thynder file is in the folder. The second one is fine though. It's an error when you just open a menu too fast after loading the game, unfortunately unfixable.