James, I was immediately drawn to this by title alone, as "The Bell Jar" by Plath was one of the most intriguing reads I've ever encountered. "Head in the oven, half-baked heart"-- MAN, was that clever. Dark, but clever!
When I originally read the book, I didn't consider her so much angry as hurt. But obviously, bitterness drew her farther and farther away from any sort of hopeful, positive outlook, and so your line was a good observation: her rage kept her locked up in that bell jar!
2 thumbs up from me!