I thought the same thing about the ending, but after discussing with some other watchers, I've come to the conclusion that she didn't dismiss it so much as she just, in that moment, *needed* it to be over.  She didn't want to think about the implications of the fact that Tyson might still be alive. 

I thought the same thing about the ending, but after discussing with some other watchers, I've come to the conclusion that she didn't dismiss it so much as she just, in that moment, *needed* it to be over.  She didn't want to think about the implications of the fact that Tyson might still be alive.