I don’t know if it’s relevant or not but she had recently gotten clean from a drug addiction.
There’s a possibility drugs damaged her heart or that she was away from home and her support system and somehow went back to drugs.
After getting off drugs it’s easy to OD when you go back to it.
Or she was trampled as they say...
Or she was an actor. Unfortunately, with a completely compromised media, nothing can be taken off the table as too outlandish anymore.