More power to her. Those requests are more responsible and reasonable than those of most stars.....
She wants to lead by example - so be it. I see no problem. Is she a dingbat? I don't know her well enough to say. She seems to care about the environment. That doesn't make her a dingbat. How far she takes it might, the whole 1 sheet thing would, but I don' t recall she ever said that. If someone has a link.....
You want stupid requests by a "rock star" - read:
http://www.mentalfloss.com/blogs/archives/9693