Great concept. A music idol figure with a dark secret to plop into any campaign.
Selenias profile, goodies and portrait help fleshen her out and give material for the warden to pepper around the campaign way before introducing the hook, and after as callbacks to the adventure.
However for The Cosmos - I feel adding some more details could make it easier to run and more engaging for the players. Reasons to stay or revisit a room, things to discover and/or avoid, subtle hints that something is off.
Getting tickets, into the venue or into the moon lounge could also be turned into interesting challenges for the players.