Dear Pixiewoo, although your DD has been "a bit of a faddy eater over lockdown", it does look like she has a fairly varied diet. However, she would be wise to include all the macro-nutrients with each meal. That includes protein and some fat. If only eating fruit/veg, her carbohydrate intake would be fine, but protein and fat may be lacking. Not all fats are the same, of course, and she should opt for those that are liquid at room temperature (mono-unsaturated) and/or liquid in the fridge (poly-unsaturated), e.g. walnut oil.
Opting for soya milk rather than standard diary is fine provided it is fortified with calcium. Many are. This is what I use because I have never liked the taste of diary milk.
Thank you for getting back to me with your suggestions as to the types of question you'd like answered in my on-line nutrition course. I can certainly advise on amounts of carbs/protein etc for dancers doing a particular amount of dance activity per day or week, but for adults only. As reaching maturation is so varied among adolescents there are no set quantities of nutrients recommended for the diet. It is just essential to encourage adequate food intake for the dancer and to moderate the training load to ensure normal menstruation takes place. This is essential for avoiding early onset osteoporosis. This is not uncommon among dancers.
Best wishes,
Louise