i hear ya....and just when whe think it can't get any worse.....
it always does.
And just when you think you've finally hit rock bottom....
the bottom falls out.
And when you feel like you just can't take anymore before you explode....
something challenges that thinking.
So what do we learn out of all of this???? Things can always get worse and probably will get worse before we die so all we can do is try to make the best of things and learn to live with (what really matters)....inner peace with ourselves and our lives.
Next time you want to bite her head off....will you promise me you'll do a number on a deserving sheet of paper instead.
(by the way...i like the gluing her to her chair idea....or how bout the ol' putting seran wrap across the toilet bowl under the seat?) 
It's kinda fun to think about being a little devious....lol