Yeah.
It should be in the east forest map where mindflayers and the other girl are placed in the buttom left of that map.
But if the door is still closed or you can't entre for some reason, it could be a bug.
Thank you for your feedback.I tested the game in the downloadable version and I played both girls routes, everything worked fine.
But I had a very old save in the editor version where I save before every mission for testing and the door is closed for both girls missions. Maybe there is something wrong with the way I set up the trigger for the door to open but again when I test it, it works fine.