[Memories roll around in Togo's head. Either because she's just now recalling them, or because this is a Murder Mystery, and a mystery can't exist as a mystery unless there are clues to advance it. Who knows how reality works right now.]

...This is the first floor, right? There's no elevator access to the higher floors in this mansion, so I couldn't have left the first floor of my own power. In other words, if I was drugged, then I suppose I could have just been rolled into position.

[Mentally adds another inconvenience to Wheelchair Life to the list.]

I remember drinking a cup of tea before this happened, so that seems to be the most likely poisoning method.