I'm not sure exactly what you thought she was supposed to do. That's literally what the trolls do if you stand far enough away from them and their HP bar is below a certain percentage. If you move closer to them, then they will start using their charge attack where they actually run or leap towards you.
You can basically only use your basic pew pew attack when the troll AI is in rock throwing mode because as you can see from the video, for some reason the parry window of that particular attack is extremely short. If you attempt to use any actual spells while the troll is doing this, you will get caught in animation lock and cannot parry quickly enough and you'll get hit by the rock. The game forces you to play like this against the trolls when they are stuck in this attack loop.
If the NY Times decides to pull a Wired on this game, they are going to get a lot of backlash. Especially since they literally posted this pro-Rowling opinion piece just today.
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