While one can see a change in Meghan, it may be less substantive than apparent, having more to do with how and where we see her now, in what venues.
Prior to November it was all to do with her career as an actress, and then we saw her in the engagement interview. Lots of energy, lots of opportunities for personality to be expressed to the camera. But in fact nothing comparable has taken place since the engagement interview, just 'set pieces' that require a 'sombre mien', Meghan making sure she is paying attention to protocol and who goes first, photo calls whose viewing is limited by the location of the camera, a lot of watching her watching others. All that doesn't lend itself to a bubbly effusive 'image'. If it did we'd have another Sarah Ferguson in front of us who 'plays' to everyone. Meghan doesn't do that, so she seems to have changed but she may not have done so. Or I sincerely hope she hasn't. :flowers
It is my one fear for her and has been from the outset: that her spirit will be crushed. However, I think what is taking place is the formulation of a public royal persona which requires very little of her personality to be in evidence (so far). She has had two occasions where she spoke publicly. In the end she may find herself having a great deal in common with Prince Charles in this regard: endlessly pilloried by the tabloid press and the public that goes along with that, but yet 'privately' does her work and charms as she goes.