I had an unshakable feeling that it was a drugging too. The POI doesn't seem the type to "get his hands dirty". Also, blood marks in a home or car can give away too many secrets. I have lots of things going on in my head where I have built on this but as it's all purely speculation, and my wild imagination, I don't think it's something I should expand on at this time.
I must admit that I do prefer the idea of her just falling asleep rather than facing some kind of physical violence as her last ever memory.
When i looked at the cards it seemed to indicate something in a drink given during a festive and " happy atmosphere" and that things turned nasty later.
Looks to me like there were three people in a room during this time.
Of course i should offer the traditional disclaimer here that " tarot is only for not to be used for decision making or taken as fact" etc etc only really its only a guide for intuition which plenty of others are using here too.
It would be nice to think A didnt suffer through some of the terrible senarios we imaginine but some alternative just seem so sinister too.