Three requests to "please stop":
- When you perceive that someone is conforming to a gender stereotype—in this case, Shiloh appearing "all dressed up like a lady" at an event she attended with her mother—it's unnecessary for you to judge her for it. You don't have to publicly applaud her for looking ladylike. You don't have to publicly condemn her for it, either. All the less so if she's 16. You could let her be, and you could reflect more privately on why you're interested in your perceptions of her femininity.
- Your belief that a particular person is cisgender (i.e., not transgender) doesn't mean it's fair game for you to use her name and photograph as an argument against the existence of transgender people. Do you know Shiloh's feelings, beliefs, opinions, and values about transgender people? Did she give you permission to use her face as an argument against them? Why is she your mascot in this fight you've picked?
- My most forceful "please stop": If a 16-year-old didn't ask you to speculate about her breasts and hormones on the internet, don't.
Leave Shiloh alone.