@Jane563 Since you're a Superhost, I'm sure you can understand this dilemma: you receive a booking request from a well-reviewed guest who you have every reason to assume will be a successful booking, no damage to your property, everything fine. But you have reason to believe that they might give you a 4-star rating rather than a 5-star.
Now, in a rational system, this would not be a problem. 4 stars still means that the stay was successful, the guest was happy, no harm was done, maybe some detail could be improved (hopefully with constructive feedback). And if your primary concern is just keeping your room full and looking after your guests, that's all perfectly fine.
BUT if you're invested in your Superhost status, taking this booking is like inviting hazardous waste into your nursery. Either you're carefully screening out guests who seem unlikely to leave 5-star reviews, or debasing yourself to make sure even your worst guests don't get rubbed the wrong way. You wouldn't take a chance on someone like A.
As a host in the know, you could explain to her how the Airbnb bots treat a 4-star review as an utter failure, because it would be uncouth for her future hosts to do so. But perhaps the more important thing for her to learn is that hosts would rather be informed during the stay when there's a problem, rather than have to wait until their review to find out the guest wasn't fully satisfied.
Airbnb's stupid status-anxiety-driven dopamine-driver is the primary culprit here: no self-respecting hospitality professional should feel held hostage to a bot and some pixels. But read these forums for a minute and you'll see, thousands of people out there are obsessing over this stuff, and A has run afoul of all of them. The host who called her out on it didn't show their best face, but unfortunately Airbnb has given them many reasons to feel that A damaged their business. So she's going to have to live with the consequences of being an undesirable guest. Perhaps you might advise her to avoid "Superhosts" when making future bookings.