I know it's bad to say, but she was probably addicted to opiates or barbituates or something for the past couple of months. Recently, everytime she would do interviews she would be very, very hard to understand (usually she's just very hard to understand because she mumbles), and she would always look like she's about to nod off. The press kept talking shit about her, so she most likely just collapsed due to stress.
Oh well...rest in peace, I suppose.