I would suggest you talk to your vet about this.  There are things they can recommend to stop the poop eating.  Perhaps you should crate her when you are not home and keep her on a regular schedule.  Each time after she eats, take her out for a walk or a romp in the yard until she eliminates and give her lots of praise  and pets while she is doing it outside.  A small kibble treat might also help. If you can't come home for lunch on a regular schedule, keep her in a crate while you are at work and take her out immediately when you get home.