It's young adults/adults fantasy series but trilogies set within series. It centres on young girl she gets trained and fall for her mentor. Think her family lived in tree canopies and brother was called Leaf. She met young girl who blew glass globes and soul searchers who lived on the plains. Also there was a palace where they learnt fire! Oh and some kind of circus was involved. I know it sounds totally random but I bought them about 6 or 8 yrs ago in water stones but can't remember anything more. Anyone recognise them? I'd love to reread. TIA