It was reported not long ago that she had lung cancer. She went fast.
I know of a very similar case of atypical lung cancer in a woman occurring right after the traumatic loss of a much loved person. The woman was diagnosed 4 months after the death with metastasis to the brain already. A hopeless battle is now being fought, mostly to decrease the pain of the final stages. The death is a foregone conclusion. The trauma of lost love expresses itself physically one more time.
I read that she had only released the news of her lung cancer because she found out some tabloid was going to anyway. She may have had the lung cancer for a while before it was reported, and maybe she didn't go as fast as it seems.