[Alusdra]

My dog did similar things- don't fool yourself that "she'll never hurt anyone." You are describing bites and near bites and extreme behavior. The likelihood she is going to end up really hurting someone is high. It would be best to find a good behaviorist. Whatever trainer you use, someone in person is better because they will be able to figure out what you're doing wrong. This is not your fault! But almost all behavior problems stem from the humans reacting in a way that makes sense for us (omnivorous primates) but probably means something completely different to a dog (carnivorous/scavenging canid).

For example- we had a choke chain on our dog and would yank on her whenever she barked or growled at someone. Result? We trained her to attack with no warning. The behaviorist straightened us out in an hour or two as to what to do to make the problems better, rather than worse. From there it's a lot of time and effort to train yourself to train your dog.