I would think that due to the Zika, she has been told to cover up.
You know, I guess Royal women have impossible standards of perfection to live up to.
All famous people are intensely scrutinized in the internet age (imagine what we would have found out about Diana many years ago if people had cellphones).
For Royals like Meghan & Kate, they are expected to look like models and also have the diplomatic skills.
I think despite the odd wardrobe malfunctions; this trip has been a huge success. Meghan and Harry have been extremely professional.
I think in planning the timing of the tour, they probably didn't expect her to fall pregnant quite so soon.
It seems like they try & fit in Commonwealth tours every four years or so. I think in future given that the Cambridges and the Sussexes have young families, perhaps they can split up the tours into 10 day chunks.
Given Harry is commonwealth youth ambassador; he & Meghan will be due to do lots of travelling. Before this baby starts school they will probably take it along on a few more tours.