Well with the first one she was having a private conversation that got caught by cameras at an official event. I expect she's said similar 100s of times but it hasn't been caught. It's the same sort of capture as the "but a sword is more fun!" comments from the G7 earlier this year where the cameras are rolling and get something interesting that wasn't official.
And whilst it probably wasn't meant to get out it hasn't hurt her and there have been a couple of times she's expressly wanted her opinion to get out (IndyRef).
As for apparently giving up alcohol, it is intimate but it's also possible it's something that she authorised "sources close to the Queen" to make public. There have always been reports of that sort "Queen advised to stop driving" "Queen has decided to have no more dogs because of her age" and things like that. I hope so anyway.
And whilst it probably wasn't meant to get out it hasn't hurt her and there have been a couple of times she's expressly wanted her opinion to get out (IndyRef).
As for apparently giving up alcohol, it is intimate but it's also possible it's something that she authorised "sources close to the Queen" to make public. There have always been reports of that sort "Queen advised to stop driving" "Queen has decided to have no more dogs because of her age" and things like that. I hope so anyway.