Finally found the stuffed animal... it was in a different mobile home then I thought. Ah well... I did venture into a tunnel filled with doors that led to the 2nd half of the game, an Acts 2 if you will. The more I play, the more evident that this game was intended to be played co-op. I might have to stop with this in mind. I don't know, what do you think?
Alright! It was tough as I had a hunter alien on my heels the whole time, but I was able to reach Nicole, who was attached to the Marker. I defeated her (eventually) and made my escape with Ellie. What a cool game. Final boss and game ending! Great stream!