I think one of the major problems here is the split in perception between the US and Uk. Her US friends are all up in arms on her behalf , leaking all over the place. Celebrity friends are all lining up to speak , have her on chat shows etc. The trouble is they don't understand how the RF works or the nuances. They're actually stoking the fires and making everything a lot worse. Meghan ought to be trying to calm the whole thing down and realise this will do her no favours.
She also needs to try and understand how the press works over here and avoid fanning the flames and portraying herself as a victim. If she was really clever she would have done so many things differently. Piers Morgan is a slug, but he is a very powerful man and she's made a big mistake thinking she could use him when it suited her and then drop him when it didn't.
Harry just seems to be a loose cannon. He's all over the place and someone (i.e. his family) need to swoop in and help him in every way they can.
A big part of the problem is the lack of family on M's side. Her Mum strikes me as someone who is very self contained, living a simple life in privacy . She doesn't seem to be someone who is interested in the sort of life Meghan wants at all. I' m sure she supports M on the phone and flies over when she can, but it is a completely alien world to her and she probably wants to have as little as possible to do with it. If M had the sort of family that Kate has, it might have made all the difference to both of them. Given them somewhere to go for comfort and love , and Harry a loving, supportive mother in law. I am sure Doria is loving, but she comes across as a loner and someone who keeps her own counsel.
Charles I am sure has done his best in his own way, but he's never had the human touch. He doesn't seem to be very close to his sons these days or very involved in their lives. The interview W and H gave about their father recently seemed to highlight that. W in particular seemed quite sad about how little his father sees his children. They have no mother, Charles should be doing his best to fill the gap. W has been very lucky with his in laws and that\s probably made a crucial difference to his own mental health. I can't imagine what he would be like if Kate's family was like Meghan's.