I'm very much not arsed about this, and I'm also very much not a conspiracy nut, but that's not her. I've had a look on twitter at all the pics and unblurred versions of the freeze frame and it looks very little like her. The photo last week was very obviously doctored.
I've no idea what is going on, but they are clearly balling this up and so doubling down rather than admitting they doctored the first photo.
I do suspect it's simply that she's still recovering from whatever surgery she had but the modern social media world and their socials team wanted to put something out on mothers day as it would be great engagement or some shit, and thought nobody would look too hard.