Answer:
She believed God called out to her as a teenager, telling her to help the sick and poor.
As she was growing up, she came up with the decision that she wanted to help the sick and injured. So she wanted to become a nurse. She was determined to pursue her dreams, even though her parents objected. So in 1844, Nightingale enrolled as a nursing student at the Lutheran Hospital of Pastor Fliedner in Kaiswerwerth, Germany. "She believed that nursing was a science and art developed by practice and discipline" - https://ojin.nursingworld.org/MainMenuCategories/ANAMarketplace/ANAPeriodicals/OJIN/TableofContents/Vol-25-2020/No2-May-2020/Nightingale-Visionary-for-Clinical-Nurse-Specialist.html.
