I dunno what to think of that. On one had the kid could have been real annoying and would need to be removed. 1 mad pax is better than 48 others. Pax always seem to have their opinion of what compromises safety and what doesn't.
On the other hand I find it hard to believe a loud child warrants a FA to go verbal if that's what she really did. A little patience could have made the difference. I'd like to know what the pilots were saying during all this. The FA isn't the final authority on turning a plane back around so it had to have been something bad for the pilots to agree with her.