Routine and structure can be very useful. Again check with the parents but a set warm up that stays the same and then a visual plan for training on a board or somewhere the child can see it could help with transitions and reducing anxiety.
Ballet bun tutorials are 100% the way to go. Some call the style a cinnamon bun! It gets the hair up, doesn’t look really bulky and actually looks really pretty. Search ‘cinnamon ballet bun’ and you’ll find so many videos on YouTube. Make sure you use some good thick bun pins as well as Bobby...
Is she a perfectionist? It sounds like only working on new skills there’s zero expectations internally or externally for her. So it’s less scary. You do well it’s a nice surprise, you struggle well it doesn’t matter because no one was expecting anything of you.
Sounds like the bigger picture...