I'm pretty sure Georgia and Burgundy called her out on that, didn't they?I wish the dub writers would let the characters call Iris on that.
And yeah, that Iris is as childish as Ash and others is pretty obvious - that's one of Iris' flaws. Also, I don't think we were supposed to feel sympathy. For example, I felt excitement when I saw Dragonite disobeying Iris. Sure, it was bad for her, but she needed to go through it. That was supposed to happen. You can't just have a Pokémon who disobeyed you two episodes before go to suddenly obeying - that's impossible.