Many thanks for your helpful reply, @DadTwoGirls. Over the years, my D has devoted a substantial portion of her non-school time to music (individual lessons, Saturday program, practice practice practice) and, while she has engaged in other activities, they are less significant in terms of time commitment.
Recently, D has started to reduce her musical commitments and, with the freed up time, has taken up a new sport. Although we (her parents) were a bit concerned about the timing of this change of focus, we have tried to be supportive. Importantly, D seems happier even though she’s an absolute beginner in the sport - I think she feels a bit liberated because this is an area of her life where she feels no pressure to meet (high) performance expectations.
My D is planning to apply to US and UK universities and if her change of focus makes her less competitive in the US, hopefully she’ll be able to secure a place at a good UK university (where extracurriculars have less bearing on admission).
Thanks again.