"Did she put on a strong "got what he deserved face" but you could tell she was hiding her true feelings?"
No she was truly devastated, she really loved him. However I don't think she put any blame on herself. Robert was a alcoholic and she blamed that for his death. On the other hand why was he an alcoholic?
Before he died she was nice enough to send him a watchtower subscription every year. She loved him that much.