After graduating from high school in Tehran, Kasra moved to England to continue her education where she got a bachelor's degree in English literature from King's College London.
Before the revolution, she wrote famous memorable songs for artists like Hayedeh, Nooshafarin, Elaheh, Ebi, Sattar, Mahasti, Golpa and Nasrin.
In 1986 Leila Kasra wrote the song "Tanine Solh" about the Iran–Iraq War, and it was performed by Andy & Kouros, Fataneh, Moein, and Morteza.
On Tuesday May 16, 1989, after a twelve-year battle with breast cancer, and seventeen surgeries Leila Kasra died in Century City Hospital in Los Angeles.
Her funeral was attended by many artists such as Sattar, Homeyra, Andy, Hassan Shamaizadeh, Shahram Shabpareh, Alireza Amirghassemi, Morteza, Soosan and many more.