Help me find a book

I think it's called something like Illuminate? or something similar
Author has a double barrel last name I think? their initials might be AHR
It's from the perspective of a teenage girl, she has two sisters and her mother died
Her mother was a famous artist, weird mental health, smoked a lot
I remember there being a studio, pottery in it, a kiln, used to belong to their mother but it seemed to be being used
Girl has a boyfriend (maybe ex?) from Manchester

I really want to find it, thank you