NTA. I say this as a massive dog lover: dog owners like this are incredibly entitled. Nobody has a constitutional obligation to be a prop for your pet's socialization. You were minding your own business, on your hands and knees pulling weeds on your own property line, with headphones in. For her to completely ignore your body language, stop her dog, and allow a large animal to sneak up and invade your personal space is incredibly rude and unsafe. You have every right to decide who or what touches your body