I am writing a story that centres around a person who slowly grows larger and larger overtime, to the point of kaiju-size and beyond. They grow due to magic, so other than their vastly increased size I can say that they are at least physically exactly the same (same proportional skin thickness, bone density, etc). What I want to know is what it would take to hurt or even kill a giant human of varying sizes. What weapons would be effective and what wouldn't be? The three sizes I have in mind for this question are: 100 feet tall, 100 metres tall, and 500 metres tall. The story is set in a modern day setting, in an unspecified generic Western country. Thank you in advance!
Edit: For the sake of having this scenario work, the square cube law is ignored. The giant can carry themselves just as well as they would if they were normal sized. I am purely interested in how attacks against her by human forces would fare.