in answer to your first question is she a complete waste of time i'd say no but that will all depend on what you do with the dog now, bearing in mind the dog is still a baby. as to whether the owner has completely ruined her, not yet but given time i'm sure he will manage it.to answer the third question,this is a tricky one, once they jack do they jack for life,no but when even the best of dogs,the legends are pushed beyond their capabilities they will jack,everything has a jacking point ,the trick is to know and understand your dogs capabilities