Honestly, with so many email threads she probably just didn’t realize there was another and thought it was one she had already replied to.
The amount of constant texting and emails feels chaotic just reading about it. Perhaps it’s adding to your anxiety rather than giving you time to process and let your thoughts and emotions settle a bit. There’s such a thing as too much stimulus. It ends up feeding on itself and expanding which is the opposite of what you want.
Perhaps a bit of a limit on the amount of back and forth is needed to quiet your system down? It’s just a thought. It just sounds so chaotic and counterproductive.