Rainbow Daah has to be told to do her job half the time. She couldn't even be bothered to study about a topic she loves (Wonderbolts) for her dream job
I'm guessing she joined the human world right after the previous games had finished, and since Canterlot lost badly and hated the games, no one wanted to talk about it there.
She's probably tell them it's too dangerous. The only reason she took Starlight is because of her friendship with Twilight, so she knew Starlight was trustworthy.
I prefer Equestria Girls. Equestria Girls had more plot variety and better character development for its characters, IMO. And the music was better too.
It's pretty cool how they made all the sciencey-stuff she says actually accurate. She's an interesting character and says a lot of interesting facts in the show.
She's always able to help her friends even if she overdoes herself. And if her friends are upset she focuses on them and gives it her all to make them feel better.
Best EG character, IMO. She's strong and smart, and she can admit when she's made mistakes, but doesn't let them define her. And has the best character development in the series.