Attorneys representing the family of the Kensington Primary student who was denied access to the school in 2018 because of her dreadlocked hairstyle are challenging the full court's ruling that the child's constitutional rights were not breached.
The hearing began in the Court of Appeal on Wednesday morning.
Queen's Counsel Michael Hylton argued that the Supreme Court erred in ruling that the child's religious rights were not breached.
Mr. Hylton said the court, in accepting that the child's locks were an expression of her Nazarite beliefs, should have found that her religious rights were breached.
The case sparked public outrage on perceived systemic prejudices against the Rastafarian culture and Afrocentric hairstyles.