I looked and virtually all of the indoor kid portraits were shot with an almost totally, 100% identical setup. One BIG round umbrella camera left. I do not think it is a shoot-through though. It throws a very soft shadow and the lighting looks a bit crisper than many shoot-throughs yield. I suspect it is a large, 60 inch diameter or bigger, round light, and it looks like she typically stands in front of it...her head takes a small "chunk" out of the highlights on many shots, down at the 5 o'clock position. Could be an octabox, or maybe something even a bit MORE-rounded, like a 10-rib design, or maybe even one of the new Paul C. Buff PLMs.Perhaps she would tell you? Does she have a blog that references her equipment?