"O Messenger of Allah, Allah is not shy to tell the truth. Does a women have to perform Ghusl if she has a wet dream?" He said: "Yes, if she sees water." Umm Salamah laughed and said: "Do women really have wet dreams?" The Messenger of Allah (ﷺ) said: "How else would her child resemble her?" That is, if she has an emission of the fluid of an orgasm.
Sunan an-Nasa'i Book 1, Hadith 198
← Previous Hadith "O Messenger of Allah! Allah is not shy to tell the truth. Inform me: if a women sees in a dream what men see should she perform Ghusl from that?" The Messenger of Allah (ﷺ) said to her: "Yes." 'Aishah said: "I expressed my displeasure and said: 'Does a woman see that?' The Messenger of Allah (ﷺ) turned to me and said: 'May your right hand be covered with dust! How else would (her child) resemble her?'"

Sunan an-Nasa'i Book 1, Hadith 197 Next Hadith → "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.'"

Sunan an-Nasa'i Book 1, Hadith 199