Now, as for actually streaming, we know from the audition forms that Niji stipulates streaming at least a few times per week (don't know if this just applies to the first year), while it is also possible that new requirements came up at contract renewal. Whatever the case, I believe Selen's on-camera behavior should be observed closely in these coming weeks and months. A big indication of her overall mood will be her voice, especially if she streams for longer and loses more energy, if she streams for longer than a few hours.
As always, archive everything; tweets, streams, even member-only content. Our time with Selen is likely very limited. However, much rejoicing will be had if she pops up elsewhere or goes indie. She already possesses a strong network consisting of reputable content creators and esports players, one she can take with here wherever she goes. Even if she decides to stick to an indie endeavor, her fans will most definitely follow. Though the income may not be as high as a Niji liver, I'm sure she's more than capable of making bank via merch deals, donations and what not (maybe even a donothon?).
If and when the graduation happens, it will almost certainly be a nuclear event for the branch. If Nina and Mysta's departures didn't convince their colleagues to leave, Selen's will most likely do just that.