Is my wife damaged goods?

I've been married 7 years now and gained two stepchildren and nephew who's mom is in jail, and I've made some unfortunate discoveries concerning my wife and her screwed up family,my wife has a history of abusive relationships,molestation,out to lunch on drugs dad,dead baby's daddy etc.,first off she is a hoarder and keeps a dirty nasty house and passed her scumbag style on to her kids,she was hiding this behavior before we married, back then her roomate tried to hint to me that she was a slob normally except when I came over but I didnt catch the hint because it was kinda clean when I went over,I bring my stepkids to my dads on weekends durring the summer,I recently was alerted that my stepkids left garbage and old food in the drawers and under the bed and filth all over the house giving my dad an ant infestation and mice,and that they have been stealing expensive things out of his house,,I told my wife and she regressed , got defensive and reacted like a child about the matter and now she's undermining my authority with the kids and saying my biological kids are just so perfect because they behave,dont steal,flush the toilet , get good grades and have manners and things of that nature,Is there any hope with this nut job.? she already had counciling and takes meds for sleep and depression,the kids are also on adhd drugs , diabetes and psych meds.she resents me and my ex for raising are kids well and wont see eye to eye on raising hers properly.and it's not just my personal observation,her mom and stepdad said they didnt raise her this way and try to show her the errors in her way,friends,her family ,my family all see this but she seems to be the only one oblivious to it and it's resulting in some screwed up kids