Ridiculous lawsuit, it's not Starbucks' responsibility to parent your children for you. I worked at starbucks years ago and when we made the kids hot chocolate, we'd always put cold milk into it before serving it so I find this hard to believe.. more like she ordered a small normal hot chocolate.... not to mention how did she grab it for her daughter and not feel something hot enough to remove skin (drinks were served at 160 degrees by default, which won't remove your skin. I spilled stuff much hotter than that on myself there before) so this had to be like blazing hot like 190 or so?
Either way, this parent needs to be a good mother and test anything remotely hot before serving it to a child, that's just straight up neglect.