I would probably wait to see what happens, as nothing may come of it. If it does, I would simply explain it was a simple misunderstanding. If it is known she has a problem hearing then surely they would understand that.Never start worrying till there is a reason or cause for it. Ancient wisdom from the Sergeant that helped me stumble and bumble through being an officer. Stuff like that can be worrying, yet it may not amount to anything. Good luck.