It is narrated from Sayyidah Umm Salamah (may Allah be pleased with her) that Sayyidah Umm Sulaym (may Allah be pleased with her) said: O Messenger of Allah, does a woman also have wet dreams? He (peace and blessings be upon him) said: "When the yellow fluid comes out, let her take a ritual bath."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 19963