Hello, RoyalMQ ! I am reviewing your story as part of the "I Write" challenge!

I see this was written for the Daily Flash Fiction contest, which has a rather short word count limit. I think you did a good job crafting a story around the prompt words, and you even managed to give the reader a surprise comedic ending! Nicely done!

For the most part, the story is grammatically sound. There were a couple of things that caught my eye, however. The first one is your hyphenation of the word nonsense. That isn't necessary, as it is a word in its own right.

The next is the paragraph below:

As Margo walked into the post office to the drop letter box she thought, “This has to work. If not, I don't know what else to do.” She lifted the lid and let the letter slide down into the box. As she watched the letter fall she recalled the words she had written.

I found more than one issue in need of attention in this, and I think it would benefit from a little revision. Consider this suggestion:

As Margo walked into the post office, she thought, This has to work. If it doesn't I don't know what else to do. She lifted the lid to the drop off box and watched the letter slide down, thinking about the words she'd written:

I'm not sure if such a revision would put you over your word limit, but hopefully you can see the difference in how the sentences flow. I think a semi-colon would be appropriate after the last sentence since you are going right into the memory of the letter's contents.

Overall, I enjoyed the story and was quite surprised by the ending! Well done!

Best of luck in the contest!