I can imagine that facing the scrutiny of crowds and cameras alongside your in laws who clearly dislike you and have been slandering you in interviews and podcasts would've been really challenging, while grieving the loss of a family member.
To be fair, Meghan seemed just as uncomfortable and no doubt it was one if the hardest things she's had to carry out as well - it certainly appeared that way. Of course the Sussexes silently knew there was more to come, as the book had been completed by this point and they knew the mud they'd thrown in the book, must if it at Kate & William.
I can only imagine how Kate & William feel about public appearances with the Sussexes now after the book and more interviews. I feel the bits about Kate in Harry's book had Meghan's fingerprints all over them, I have no doubt she wrote those bits as she has an axe to grind.
If I was Kate I'd be refusing to appear publicly with those two ever again, I'd insist that the opportunity to ever be in camera shot alongside them never arises. I'd also refuse to be in a room with them privately again - I'd adopt a 'it's them or me' approach to any family gatherings...but I'm petty like that and I'm sure she's a much bigger person 