Originally Posted by
Alty
You have a lot going on in your home. Since you did get a clean bill of health from the vet, I would say that this sudden change in behavior is due to all the issues at home. Your son may be stressing her out. Some dogs can be trained to accept screaming, others can't. You can try working with her on this, but I would recommend a personal trainer, one that comes into your home, does an assessment and then makes a recommendation on the training needed.
One final question. Is she fixed?