Went late last night and really enjoyed it, I jumped so many times and im not really one for jumping as I always normally can tell when they are coming.
I didn't get why that woman killed Chang as she killed that other woman in the neck by accident.
Re: The ending - I think that she fell down banged her head then what we saw her running to safety was just a dream, the director wanted to make us to think it would be a happy ending. Then she wakes up and we see she has no chance of escape, she realises that and knows she will will soon be in heaven with her daughter. Thats why she is grinning like a loon with her daughter and the cake.
9/10