I was looking at schools in this area a while ago.
I agree with recommendations for Northern Ballet, perhaps try their open classes until your child was able to apply for associates again. The exemplary, particularly for ballet (which is what we were looking for) schools I came across or were highly recommended in or outside of Leeds included.
Sara Packham Theatre School
Strickland Cook Theatre School
Yorkshire Ballet Academy
Maillot Rose School of Theatre and Dance
Northern Ballet
Northern Dance Centre
Doncaster
Hazelbiz Performers Academy
Allegro Theatre Dance Academy
Marilyn Baker School of Dance
Scunthorpe
Joyce Mason Dance Academy
Hull
The Arts Garage
Skelton Hooper School of Dance