No,
I don't mean the mother hacked or did anything like that. B covering and 'taking care of it' for mother. Ana may of fallen and hit her head. If so, instead of calling 911, they did this. ( only imagination if mother did lunge at Ana and accident happened and B took over for mother).I somehow cannot see BW’s mother dismembering Ana after the fact. Are they both involved? Anything is possible. They have a very cozy unhealthy relationship. Imo