I really enjoyed playing your game! I got stuck trying to find Ruth, but I retraced my steps and eventually found the room where she was. The setting is really cool and I wanted to know more about the ship and why people were trying to sabotage it.
Where did you find Ruth? I'm having the same problem.
It's been awhile since I last played so I don't remember where she is anymore, but my advice is to retrace your steps. Some places change after you visit them or another event happens. If all else fails, just check each area. She's there.