I have a player that constantly makes comments. For example, they're all stuck in Barovia currently and they were up against a Druid with a pack of twig blights. Needless to say, a party of 6 PCs plus an NPC that got stuck with them during session zero was super OP for the encounter, given that I'm still pretty new and was rolling like garbage that session.

Anyway, the Druid realized that they were S.O.L and tried to flee. As I narrated them turning tail, the player interrupted me mid-sentence to snap "well they get two attacks of opportunity". And I'm like " ??? Yeah, I know. They're still trying to run." At that point, the narration has been shot in the foot and I just tell them to roll because the moment is gone.

It just really takes my excitement for narration away. I've messaged her and told her that she needs to just PM me if she has an issue with something, going as far as to say that the previous session was way too busy with the two of us trying to DM... but it's awkward. None of my other players are like this.