Tsarevna Natalia Alexeyevna, younger sister of Peter I by Ivan Nikitich Nikitin (Hermitage)
She was a famous playwright according to her Wikipedia article.
Tsarevna Natalia Alexeievna wears her hair curly and long in this Nikitin portrait.
Keywords: Nikitin, Tsarevna Natalia Alexeievna, Tsarevna, Romanov family, Russian, long curly coiffure, hair jewelry, scoop neckline, modesty piece, jeweled bodice ornament, order sash, robes