What Happened to Soji and the Other Synths?

The last time we saw Soji—the synthetic descendant of Data and ambassador for her people to the Federation after they decided to un-ban synthetic beings from being researched and developed—she was off on a whirlwind diplomatic tour to promote her kind to the wider galaxy. And… that’s it. That’s presumably what she’s still doing by the time of season three, but not a mention goes by, either in the context of Data’s return or just, like, in general.