Your last paragraph is the one way I could envision the SM being involved in a cover-up. Perhaps she had some Xanax or some other prescription for herself and gave some to Karlie. Maybe she even looked up to see if it had a reaction with pot. Kaylie either had a bad reaction or passed due to whatever the joint was laced with and the SM panicked thinking she was responsible.Maybe I can offer perspective. I am in my 20's now, but when I was 16/17 I took an edible (I had smoked before, just not taken an edible.). I figured I would be fine. I thought wrong. I straight up could not feel my legs, I thought I was in the war of 1812 for a moment, couldn't stop calling a friend of mine Madame Secretary.
I was so panicked that I couldn't feel my legs I was convinced I needed medical attention. It was sheer, full-blown panic. I ended up calling my mom at 5 AM and she was able to come to get me and calm me down but I BEGGED her to take me to the ER. Thankfully, my mom is an RN and got me to fall asleep. So I can see if Karlie got too high or whatever may have happened, she just took off. I wouldn't have put it past myself if my mom didn't deescalate the situation.
I had Xanax (prescribed) and I also BEGGED my mom to let me have it so I could calm down. Again, luckily she was able to hide it and I fell asleep. Just a thought.
I still think we will find Kaylie somewhere for better or worse and we will have our answer.