She might be referring to this screenshot:Ok where is this screenshot shes talking about? I only saw her profile pic changed to a pic of her.
But as far as someone on Becky's profile being a "backstabbing bitch", Amber is being an idiot. That is a screenshot the status change of Becky's profile picture, and if you look at that icon, it is public. No one needs to be friends with Becky to see it or screenshot it.
Amber is right that the only reason we know about it is because @FrazzleCakes posted about it on the Farms. That's the only part she got right.