A few years ago I'd have said Blonde but her face has changed quite a bit since then and the dark hair in Grown Woman really suited her features, in her younger years the dark hair made her look basic but now it just adds to her beauty
She can rock both because of skin undertones. Blonde works very with her natural light skin tone. While brunette only works for her when she has a tan. However, I prefer her with blonde, it brings a golden glow to skin