"I asked the Messenger of Allah ﷺ about a woman who has a wet dream and he said: 'If she sees water, let her perform Ghusl.'" (Using translation from Nasāʾī 198)
سَأَلْتُ رَسُولَ اللهِ ﷺ عَنِ الْمَرْأَةِ تَحْتَلِمُ فِي مَنَامِهَا فَقَالَ «إِذَا رَأَتِ الْمَاءَ فَلْتَغْتَسِلْ»