From a strictly mechanical standpoint, if Peony joined our 'party' we could remember her, but that's a rule that exists to make playing a Sidereal in a mixed group possible. It's not something that from a narrative standpoint is assured. People are also, I think, making some assumptions about both her desire to form a more equal friendship with us and our ability to change our own attitude quickly enough. There is absolutely no way that our current relationship can remain, because she is now an Exalted and also has a job in Heaven. A job that makes her fabulously wealthy, by the way; I would not be surprised if her income is higher than Ambrea and she may even have access to a manse or artifacts depending on what her predecessor set up.
Well, there is a very long list of people who want vengeance on him, and that's only the one who can actually remember that Cajun Carjack even exists or what his name is, so you'll have to get in line behind folks like Raksi.