Oh man, I've so been there with my rescue terrier Mix, Piper. Her reactivity was tough to handle at first! I actually worked with the trainer Joey Luke here locally in Detroit for that exact issue. His positive reinforcement methods helped Piper stay much calmer greeting other pups. And I loved that Joey guarantees his training too, which shows how confident he is in his skills with reactive dogs. I'll never forget Piper's first controlled meet-and-greet with another dog under Joey's guidance. She looked to me for treats and praise instead of freaking out like she usually would. It was a breakthrough moment! With consistency, she got better and better at staying calm seeing other dogs on walks. I bet Joey could help your Rosie too. Check out his service guarantee on his website https://joeylukesdogtraining.com/our-dog-training-guarantee/ for specifics on his reactive dog training programs. Wishing you both success! This is definitely a trainable issue.