The pencil snapped as she attempted a particularly grand pirouette with it betwixt her fingers.

There it is! After the discussion on Discord, I had to go find your post and see the context in which you used the word "betwixt." This is perfect. Ursula sees herself as a sophisticated writer, and you help the reader perfectly get inside her head by using this rather lofty word.

My heart goes out to Ursula. My sense is that she is never going to make it as a writer. Not only is she absolutely devoted to clichés, in spite of her efforts to avoid them, but she can't get past the first line. Yet, she is already imagining her book signing!

You had several lines that made me laugh, starting at the beginning:

Don't you hate it when clichés get stuck in your mind and they seem to be stuck there?

That made me laugh out loud. There were several within the story too, like this one:

With a degree of meticulosity she deleted each letter in her word document.

I love your sense of humor!