Agree with the above. You need to make sure that you understand directions for future assignments - you can ask her to clarify and say something like:
“I really misunderstood the directions and I’d like to clarify so I don’t make this mistake again. I thought when you said X you meant X but it looks like I was graded down for doing X. Maybe I misunderstood the instructions or why you took points off?” Can you speak to her? Even via zoom?
This assignment is done and the grade isn’t going to change.