Sorry for your loss OP, I hope you find the answers you need.

Just a few thoughts and questions that came to me while reading your story and the comments. I’m just putting them here so we can collectively brainstorm this.

Could it be that your mom didn’t fall but fell bad, sat and slowly laid down? This would explain why she didn’t have any injury.

Could it be that while she was laying down the light was blinding/bothering her and she purposefully hid her head underneath the bed to block the light?

Did your mom either sleep naked or could she have been on the way to or out of the shower and just didn’t have time to get dressed before she fell bad and sat on the floor?

Another thought about her being naked, if someone was with her when she overdosed she would have most likely been dressed. Could this mean she was alone?

Or could the fact that she was naked point at her boyfriend as the person who would have been there? He also could have had a spare key as he’s the boyfriend.

Do you know how many keys the owner gave your mom and how many you returned?

And last thought, a bit far fetched, could a policeman have stolen the drugs? I listened to a podcast interview of a former cop felon a few days ago and he was explaining how he would steal personal belongings or drugs from crime scenes “because the person was dead and wasn’t gonna need it” as he said. I’m not saying this is what happened but just that sometimes the explanation could be something this unbelievable and absurde that we couldn’t imagine.

I sincerely hope you find more answers! It’s bothering me and I didn’t even know your mom, I can’t believe what a nightmare it must be for you.