Oh, Virgo, such a little innocent.
She said that she's received lots of scripts and she took this one because it seemed like it's the most fun. This is called denial. She may have received "lots of scripts" but how many came with a firm offer? The rest is publicist-speak.
As far as what is she thinking? I'm thinking she might be thinking, I'm 18 and I'm building a resume outside of "Hairspray". Who knows what she is really thinking, but it might be "I had better take the money while the iron is hot. No matter what."
What's the point in her waiting and waiting for another project? She might want to wait until the Hairspray press juggernaut has a chance to work it's magic. With the sort of reviews she is getting and the great BO it would not be long before some major offers would come her way and she wouldn't have to settle for what looks like the next direct to DVD comedy that will be in the bargain bins in a month.
This move will be shot and over and she'll be working on her third and her resume will be that much more longer. You know some actors have resumes longer than Meryl Streeps that couldn't get cast in a bus and truck of Cats. It is what is ON the resume not how long it is.
I wish her the best of luck and hope she does the smart thing.
PEACE.