“her handcuffs, which ended up around her neck”
I can’t even imagine what this could mean.
I’m thinking that she must have triangle choked herself. I can sort of see how it might have happened. She does appear to be thin in her picture.
Starting from being cuffed from behind...if she raised her hands up her back all the way to her shoulderblades...then could bring one elbow around and try to get her head through (yeah which is pointless)...she’s got one shoulder on one artery...and the handcuffs on the other artery of her neck.
But she’d have to be very flexible.