I got that impression from reading the article, but wasn't previously familiar with them since I don't pay much attention to the personal lives of celebrities.
I'm not aware of her career much, but I noticed in the article it said she was a regular at TV commercial auditions by the age of 4, which made me think the parents were very much invested in her career, and this may not necessarily have been a situation of a teenager approaching her parents for permission to do a great role for the sake of artistic expression. It paid off with money and increased fame, apparently.
I see the article states the parents "encouraged" her, so that makes me wonder if she originally was hesitant and/or if they decided it was it good move for her for "launching" her career. Otherwise, I would have thought they might have "consented, rather than "encouraged."
I guess we'll find out if she ends up writing memoirs whether or not down the road she continues to think this was a great decision she made and is happy for the support of her parents, or if she felt pressure from her parents and ends up being resentful. I get the impression sometimes with child actors they may be used as "workhorses" for their parents.
Either way, like getting a tattoo, showing one's boobs on the movie screen is something one can't take back. It might be a decision a person is glad they made. It could be something a person regrets.
I don't think there is an ethical/moral problem with taking one's shirt off, but I would expect it to change the kinds of interactions she would have with people who had seen her boobs. I'd rather protect my child from a decision she might later regret while she still young enough to require my permission, and let her make the decision on adult things when she is an adult.