I think we on the outside forget how parochial it is in that house. You are completely cut off from the outside world (except Sharon Osborn, apparently), with no knowledge of world events, or news of family.
Everything must become so blown up out of all proportion, and when things go badly for you, there's nowhere to run, and no trusted friends or family to confide in and talk things through with. Yes, they make friendships in the house, but it must always be at the back of your mind that whoever you're talking to is essentially a rival, and as has been seen, will stab you in the back to further themselves in the game.
Things that you'd shrug off, or walk away from on the outside, will become major issues. Your head will be saying "let it go", but your heart will be saying "this is major".
I'm not surprised she's feeling very emotional. I'd be bawling all the time, as my emotions would definitely get the better of me.