I'm not really the best person to talk about emotion--I tend to have far too much distance in my own writing >.> which has to be rudely beaten out of me by my very-patient CPs.
But I guess I would say that it's not really about applying that to every single thought, so much as every single thing *is* a thought that is coloured by the MC.
The example you gave in the post above is fine, just incomplete. It's a negative space statement--she doesn't want to be here, fair enough. So why doesn't she want to be here, and where does she want to go instead?
She looks around--what does she see? Dog turds, potholes, rusty fences, empty high street, broken cars, something that she fixates on as being unpleasant? What's appealing about the beach, or the spa? Just a change of scene, the weather, etc? What makes *you* want to leave somewhere, or go somewhere?
(I appreciate that was just a single line, though, and you could easily flesh it out with more lines--not everything fits into one sentence.)