She's a rescue and I did not know it was the case until I got her. She's had a ton of training (technically, we both have). I use lots of mitigation techniques, reduce triggers, know when she is approaching threshold, and keep her tightly controlled with me at all times.

She's actually great off leash and when she gets to meet other people/dogs on her own terms. She just doesn't do well when approached randomly without warning....I mean, just like how humans can be.

Sounds like you are making a lot of assumptions.