So her line-of-sight mechanics are basic as hell. Her vision has no range, so as long as she has an unbroken line of sight on you, she spots you. So if you get f'ked like I did with having a corridor 8 doors long all with an unbroken line of sight, she can literally see you from the other end of the map.
Giving her sight a limit might make her a little more fair. Also, I've noticed you've tried to do the Alien Isolation thing with her, as she is constantly always moving towards the player. Couple this with the previously mentioned line-of-sight problems... yeah, she's not fair at all.