What is the symbolism of SJ's green nail polish in the novel, Dear Martin?

SJ’s green nail polish symbolizes devotion and support. Once, when she and Justyce were still close friends and subtly flirting, she asked him what his favorite color was and bought a green nail polish to match it. When he sees her wearing green nail polish at Manny’s funeral, he understands the message she sends: no matter the misunderstandings between them, her affection continues and she wants to support Justyce however she can.