Thanks for the update Elizabeth. There were a few other formula suggestions if you're concerned about any lack of progress.
When you read this reply, can you also just update the case itself? Click 'View Case Report' above, then 'edit', then select the type of recheck you'd like to use (dates vs. days). You'll then be able to enter your recheck as at July 20, where you note what you're using and her status (improved or not).
Let me know if you get stuck and thanks for contributing this case!
Steve