Most people work out that there are tricks in the world a little later than Ophelia does. I guess she really is an innocent. Even an 8 year old child in this day and age understands that not every one is honest, that the world doesn’t always do the right thing or the fair thing. A child can understand that a magician is tricking them and not REALLY performing magic. But it feels like this might be news to Ophelia. “No! He didn’t REALLY saw that woman in half and put her back together? There aren’t magic rabbits in that hat? He didn’t really put a rope back together by waving a wand over it?”
That sort of late revelation really might explain why Ophelia goes crazy so quickly. To suddenly be thrust into a world of distrust would be incredibly disruptive.