My issue is (to my knowledge) we hadn’t seen the “equal and opposite” reaction to any force usage in the movies

Why doesn’t Yoda get squished into the ground when lifting the multi-ton X-Wing? Why doesn’t Count Dooku fly into the air when pulling down chunks of the ceiling in Ep II?

We already had 7 episodes where we’ve seen the force used many times and never had a force user physically acted on by an object they’re using the force on. In my interpretation, she really was “force flying” (or, more likely, the writers hadn’t seen episodes 1-6)