So? If the Queen, who only allegedly backed Brexit, actually backed Remain, would this make a difference? What about the next in lines ... Charles, then William, then George ... all Brexiters too, these unelected Germans who are long to reign over us?
Oh the irony, but it does not matter. They are just people, but the OP is an appeal to authority to suggest that because they are "special" people their opinion is somehow more right than anybody else's. With more irony, Khandro reverses the OP and states that it's because they are NOT special their opinion counts. Either way, their opinion makes no difference at all.
One might ask why Laura Kuenssberg brought this up. Is it because she and/or the BBC is pro-Brexit or anti-Brexit? Pro-Monarchy or anti-Monarchy? Or just wanting, in this year of fake news and post-truth, to stress the BBC's second source policy with a really good example of why it's needed?