She would be oldest living person. And with Jeanne Calment she would be only person who has evidently reached age of 120. I doubt that she would anymore public apperances. And court is surely careful that she is not getting to say anything non-acceotable. So they don't tell her how to use computer or smart phone and speacility not about Facebook and Twitter or other social medias. Altough she hardly is going learn anything new anyway.
I highly doubt that she would be happy with marriage of Harry and Meghan. I am actually bit unsure would she accept marriages of Charles and Camilla or William and Catherine. But it hardly has any matter when court probably try keep her out of publicity. And probably privately she would be very happy with Brexit but she is not going saying anything when royals can't have political opinions or at least not tell about these publicily.