The whole thing is ugly and it's best if they never see or speak to each other again. Too much water has flowed under their bridge.
Just because people, who have nothing to do with Meghan, opine that she should reconcile with him, for their reasons not hers, doesn't mean it's right for her.
millions of people, many of them on here (Stately Homes) fall out with parents, family, friends. They're not told "it's disgraceful, you should be ashamed of yourself. Reconcile with that parent/sibling/relative immediately!" They're told "do what's right for you, it's your adult choice".
Her father does nothing to enhance her happiness, that's obviously the best reason she isn't in touch with him. Good for her.