She died at age 30 of a heart attack.
Per the story, she drank 8 to 10 litres of Coke a day (which is about 3 or 4 times what G drinks during his most thirsty times). She also smoked about a pack of cigarettes a day and didn't eat well.
Our stuffed animals have background stories. The stories then evolve. This is like a soap opera. Isn't it?