Yes, I would just guess that no obvious cause of death to mean no external bruising, stabbing, GSW, etc. Suffocation or manual strangulation would still be on the table, and possibly more, depending on the condition of her body in terms of environmental factors. I wouldn’t necessarily assume an overdose or poisoning.
I do have some concerns that after two weeks, there may be no video from the cameras, if they were even running at the time of her burial. It may have been taped over by now or just monitored in real time by a security service. And certainly plenty of cameras are purely for looks, versus actual surveillance.