She sounds very defensive, good supervisors invite questions, it broadens their insight allows them to see things they might otherwise miss. The old many eyes, hands are better than two. I don't think you are over reacting. What you choose to do depends on the outcome you want. You could try to approach her when the two of you are alone and inquire, get a rep to help you inquire about her over reactions. You can choose to do nothing accepting that is how she is going to be. Or call her out next time she does that. I'm sure there's many other options but she is the one over reacting not you.

I'd say she sees you as a threat, possibly because you have been doing this a while and are good at it.