It was narrated from Anas that Umm Sulaim asked the Messenger of Allah ﷺ about a woman who sees in her dream something like a man sees. He said:

"If water is released then let her perform Ghusl."

أَخْبَرَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ، قَالَ حَدَّثَنَا عَبْدَةُ، قَالَ حَدَّثَنَا سَعِيدٌ، عَنْ قَتَادَةَ، عَنْ أَنَسٍ، أَنَّ أُمَّ سُلَيْمٍ، سَأَلَتْ رَسُولَ اللَّهِ ﷺ عَنِ الْمَرْأَةِ تَرَى فِي مَنَامِهَا مَا يَرَى الرَّجُلُ قَالَ " إِذَا أَنْزَلَتِ الْمَاءَ فَلْتَغْتَسِلْ " .