A wonderful story! You've created a world that I'd love to learn more about, for example - what is the purpose of the forbidden book, and why do Aithne's parents have it? Additionally, the use of both improvised weapons (the chair and walking stick) and the antagonist's use of words as a weapon fit the theme well.
I could follow the flow of the story, though there were a few sections where the formatting was jumbled, especially around dialogue. Given that this had to all fit on the page, I can understand the challenge.
A few ideas to improve should you revisit this story. With only 1,000 words, you have to choose your scenes carefully. While everything you wrote works, I also wonder if perhaps some sections could have been reduced to allow other points of the story to develop further.
Perhaps starting with Ainthe arriving at the butcher's shop and considering her situation (i.e. "Her parents and brother missing after a trip to the butcher's, Aithne clutched at the stolen page from her family's forbidden book. It was her only comfort as she entered the butcher's shop.") would allow for more space to develop the world around Ainthe and answer questions such as what the book is, provide more details on the setting, etc.
Please don't let me above recommendations detract you, this was still a wonderful read and look forward to more! Thank you for writing this for the jam!