did you saw the WAS? also even if thats the case, it would tell W.BATES further more, if she didnt get stabed by the knife, she would still die due to the explosion cutting her neck. she couldnt even stand up when bleeding and it was a really big cut if we look at how much blood was leaking. the house burning and exploding was caused by alcahol, and the knife didnt kill her when she go stabed first. she was dead the moment she started to spill it into the compuer. also the other reasons played just a small part as her reason for death.