There is nothing us old timer hosts can say to newer hosts to convince them to stop worrying about bad reviews. But stop worrying about bad reviews.... you can't be held hostage by this process.
You have 8 excellent reviews. What could this person say that would harm your reputation? That you were too kind? That you made her a cup of tea and welcomed her warmly?
If she does say anything negative, you can either post a reply clarifying any point that is incorrect, or you can just leave it, and after a few more bookings he review will be buried. Note that a guest might leave you PRIVATE comments but if you reply to them you are now replying to private comments in the public forum. I always cringe when I see hosts over replying to an innocent observation in a review, I feel it's always best to be brief and specific like "I wish Clarissa had let me know when I asked about this issue as it could have been easily fixed" or something like that.
I've just replied to a different question from another host and let her know that 80% of my guests don't even read the description, let alone the reviews.