You have geniuses who deduce that Meredith's friends were only catty and vicious and not reliable witnesses.
Why, thank you.
For the record, they were catty and vicious. They were gossiping. Their observations about Amanda's behavior reflect their true feelings and character -- the problem is that those observations mean nothing about Amanda's true feelings and character.
I didn't think it was the complicated of a thing, but clearly I was wrong.
While you're here, maybe you can tell us your source for the contention that Amanda was "sobbing for 2 hours" on Halloween night because Meredith didn't call her back?
Or, failing that, possibly you can explain how the English women's testimony about how annoying they found Amanda translates to Amanda wanting Meredith dead?