It’s entirely possible Rey had a bit of training before she was sent away, and it kicked in while in the middle of a really bad situation.
Star Wars without a big ball of death, is like Flash Gordon without Ming trying to destroy the Earth. 😉
I think the tension and worry for those of us who couldn’t take a vacation from the forums, and avoid spoilers completely was a unique situation. I will probably be more relaxed going into my second viewing in a week or two.