It’s nice to see a teenager doing something constructive like that (although maybe her parents say, “Are you still out there staring at the sky?!”... LOL...
When my kids got obsessed with something that wholesome, I’d just let them have at it. I never complained about how much time or effort they put into it.
I always figured that doing stuff like that would be keeping them out of getting into far worse stuff. I knew where they were and what they were doing and far be it from me to look a gift horse in the mouth.
I also wanted to let them learn the rewards that come from that kind of effort.