From him, from Muhammad ibn Isma'il ibn Bazi’, who said:
I asked al-Ridha عليه السلام about a man who has sexual contact with a woman without penetration, and the woman ejaculates. Is ghusl obligatory upon her? Imam عليه السلام said: "Yes."
Ali Akbar al-Ghaffari
Tahdhīb al-Aḥkām fī Sharḥ al-Muqniʿah, vol. 1, p. 129