that Umm Sulaym asked the Messenger of Allah ﷺ about a woman if she had a wet dream like that of a man. He said, "If water is released then let her perform Ghusl."  

أَنَّ أُمَّ سُلَيْمٍ سَأَلَتْ رَسُولَ اللَّهِ ﷺ عَنِ الْمَرْأَةِ تَرَى فِي مَنَامِهَا مَا يَرَى الرَّجُلُ قَالَ: «إِذَا أَنْزَلَتِ الْمَاءَ فَلْتَغْتَسِلْ۔»