Just that really. I supervise washing in the (daily) bath, with a particular focus on getting the armpits nice and clean. By the late afternoon there is a noticeable smell of body odour in the armpit area. No other indications of anything odd with health or development.
DD1 did not start to need deodorant until nearly 10, which appeared "normal" within her peer group, so am quite surprised that dd2 is already experiencing this.