Yes, but only in the grammatical sense of "passive", and even then it's mostly a technicality. There is certainly no implication in [ii] that your sister was not actively involved in planning the wedding, unlike Susan in [i].
Before I go on, let me point out that "to marry [someone]" has two meanings:
- To become married to [someone].
- To officiate at [someone]'s marriage, e.g. as a religious official or a civil celebrant.
As SydneyAustraliaESLTeacher's answer says, the literal meaning of "got married" is that you have been the recipient of an action ("married", sense 2). However, sense 2 is falling out of usage, at least in my corner of the world (Australia).
As a result, "to get married" is, in my experience, treated as if it were an active verb. (It may count as a phrasal verb.)
* If I say "Jim married my friends", it clearly means that Jim was the officiant at the wedding, but it would give many people pause; they would need a moment's thought to work out that I'm not talking about polygamy! As a child, I once got very confused reading about the origins of Valentine's Day, when Saint Valentine got in trouble for marrying many Roman soldiers...