LW1 thinks "he's friendly" means it was fine for her dog jumping on a stranger, but when the stranger pushed the dog off and fled, that becomes "shoved him off her, hard, at me."

LW is the one who knows the dog is "just excitable" and "never hurt anyone"--and even she doesn't want him to land on her unexpectedly.

Also, she seems to be assuming that the new neighbor didn't tell people what happened. I doubt this is the first time the dog got away from her and jumped on someone: the new neighbor may have told someone and gotten a reply like "Oh, I see you met Mary" or "is Dog still doing that?"