I'm not sure if she's still a model. I follow her & Sergiy on twitter, I think she focuses on her study/career now.
She's really nice and down to earth. I talked to them briefly in Rotterdam, she first helped Sergiy with his training and then Sergiy helped her to improve her game.
They are one of my favorite couples in tennis, together with Arnaud & Nolwenn and Gilles & Carine.