I am an introvert and a writer I can't leave if I am writing unless the story is in my head and I will remember.
She can watch Barbie alone, it's not a great film or find a fantasy one and say: ket's watch this one together, take a notebook and a pencil, write down your plot and see if this fantasy movie brings you great ideas to improve your story.

If she does that she gets away without saying sorry. Getting him a lunch might help too but not in the next hour.