How old is your daughter and why is she giving random medications to a dog...? If she's young enough to not understand that giving dogs meds for no reason can be extremely harmful (thankfully benadryl is hard to OD a dog on), she's probably too young to have access to those medications herself. Sounds like you need some cabinet locks to keep the kid out of the medicine and the dog out of the chocolate if you can't train those behaviors out of them. As for the bed issue and mattress digging: train, deter, and/or simply shut the door - the latter especially if you aren't home. Most dogs, and this has been proven in behavioral studies, will eventually cave to temptation if the owner is away even if they are perfectly obedient in the owner's presence. Train the dog to know that the bed is a no-go when you're there, and shut the door when you're out and about to prevent lapses in doggy self control.
Though, now that I'm reading through your thread, I can't tell if you're having legitimate issues with the animal or if this is some kind of spoof. Color me dense, I guess.