So many perceptive posts here - which ring true to me.
It does seem far-fetched that no help was available to Meghan when she felt desperate. It's hard to make this 'version' fit with what we know - as stated by pps. Much more likely that help was offered, but Meghan wanted her choice (paid for by the RF), and wouldn't compromise. I don't believe for a minute that she was kept as a prisoner and left to suffer alone. And yes, Harry was her first port of call for help in that situation. I'd forgotten the Princess Diana story, which, like so much in Meghan's life, seems to be an echo of Harry's mother's troubles.
Their refusing help and advice seems to be at the bottom of so many of their subsequent problems. Apparently, the RF were really concerned about Doria being M's only relative at the wedding (bit of a red flag, we can now all see) and urged Meghan to allow her to be seated with the other members of the royal party. But Meghan was adamant Doria should sit alone. I remember feeling for her, and wondering why she was so isolated, but it seems it was a deliberate policy from Meghan. It didn't look good, and unfortunately some people inferred that she'd been snubbed by the RF in a very cruel way, when nothing could have been further from the truth.
On the topic of H & M returning to the royal fold, I agree with the poster who made this excellent point that I hadn't considered, but it's absolutely right: leaving aside the deep personal issues involved, as royals they would need to be 'water-tight- in terms of discretion because they'd be meeting politicians, diplomats and foreign heads of state. No-one will ever trust them again, so they've really blown it if they envisaged a return to high-level, glamorous royal life. Maybe the odd ribbon-cutting in Widnes (no offence - I come from near there!!) with minders, but even that would be very doubtful (I hope!).
I'm not a fan of H & M (you can probably tell) but I wish no harm on them, just that they settle down to their life in the US and stop trying to be royals in one of the worlds most established republics.