According to Georgies insta stories, Sienna has started gymnastics.
I'd personally say that at very almost 11, she is old for starting something such as gymnastics as you usually learn things such as coordination, flexibility, balance and how to properly control your body at a younger age. Sienna is likely to have highly ingrained ways of holding and moving her body that are likely not the same as those who have done gym. from a much younger age and may hinder her ability to get as fluid and controlled motions (obviously, this will usually get better over time though).
However, I am VERY glad she has been put into a class (hopefully with other peers her own age and not private sessions) so she can have proper help to develop some skills and hopefully build her confidence back up to where it was a couple of years ago!