Okay, okay! Here's what all I think we know? Mion was attacked probably while playing cards and hit on the head. Then stabbed Do we know what she was hit on the head with?

Once she was knocked out she was bled out, and the scene was cleaned up with the blanket and possibly in the sink. Once she was bled out she was taken to the closet and hung so we'd assume she hung herself to avoid the incentive.

Also: all of this was done in a very short period of time since the blood was still wet.

Am I missing anything?