You said, "rest Maryam was also never a public office holder care to shed light on this ?" I have answered your question she has held a public office. Next time please express your intent before laying false traps. Maryam Nawaz was convicted in the avenfield case when she appeared as a joint co owner of the flats through off shore companies which she denied, then accepted having the ownership but for a few months, then she attempted to mislead the court by showing fake documents. The case maintains that either the duo (because Nawaz and Maryam played tennis in the court) had significant means but for this a paper trial should exist or the property was bought through laundered money. Since the former was not addressed the latter stands. A similar case was of imran's bani gala case where a paper trail was provided.
https://en.m.wikipedia.org/wiki/Maryam_Nawaz