Thanks @goodwithagun I knew she couldn't lay claim to property and homes, but what about money? Harry's worth about $40 million.
From what I've read about British divorce it's basically you get to take back what you brought with you, if that makes any sense. If there would be a divorce, it's up to the queen to decide what Markle gets in terms of homes, staff, etc., since it belongs to the queen to begin with. For example, QE gave living quarters and a few other perks to Diana after the divorce from Charles. She didn't have to give anything to Diana, but the publicity would have been horrendous, to say the least.