Hi Vanessa:
I am in the same boat. One cancellation, six months in advance, due to a calendar mix up (out of over 50 completed reservations) and I am bounced from Superhost for a year. I also got a lovely automated "your listing is at risk" message from AirBnB. Anyone looking at my hosting history/reviews can see I go above and beyond for guests, so that was insulting.
Having said that, I wouldn't stress too much about it. Superhost is a joke program designed to push hosts. It actually gives zero benefit to the host, while raising your stress levels. I would ignore and move on. You won't see any impact on your bookings. Most guests aren't going to click the "Superhost only" button in search becuase A) most don't have a clue what it means and B) why would you limit your search results?
Mike