GHB is a party drug or club drug when taken by itself but with any alcohol or in a slightly larger dose will cause the person to pass out. Also burns through the body about the same rate as alcohol.. so gets through your system in like an hour so really can’t be tested for in a scenario like this.

Odorless, colorless, and can be made with an at home chemistry set.

I think now I remember one of the quotes saying she thought the wine tasted funny. Could be Valium, Xanax, etc etc. Lots of things could have caused the blackout.