In Part 23: Baby's Gender, Yolanda is first introduced when she finally comes to visit the girls in Windenburg. She is shocked to find that Valentina is pregnant with her first child, but still glad that her youngest daughter is happy. Since Yolanda is a General Practitioner, she uses her skills to determine the baby's gender which reveals that the baby will be a boy. Yolanda appears not to be very fond of her Son-in-Law, Paolo Rocca, whom she accidentally sees naked and appears to find attractive. Yolanda is a hotheaded and would frequently argue with Paolo.
Yolanda stays with the main household for the early days of Leo's life. She ultimately decides to relocate to Windenburg and buys her own house there, going so far as to include a luxurious guest bedroom for her grandson.
It is unknown why Yolanda left Mr York behind. One possibility is that she is separated from him.