Who is Arina from Russka: The Novel of Russia and what is their importance?

Arina, the daughter of Maryushka and the Cossack Andrei Karpenko, is from the original village of Russka. At the age of twenty-five, she marries a carpenter and icon painter named Daniel, who'd once been a Cossack and friend of her father. Arina and Daniel are both followers of Raskolniki.