Oh dear. When you get a chance, remind how old she is? The constant barking, is there an obvious reason, is she barking AT something? Or just barking? We had a family dog who at age 18 started barking just because, it was sign the end was near. The vet told us to keep our hands away from her mouth as she really didn't know what she was doing and could bite us. I point this out as you say you have the grandchildren in the afternoons.