The interpretation is the same for both female and male horses. If a person rides a horse in his dream, he will attain glory and prominence.
In the Hadeeth it says:“Goodness is tied to the forelocks of horses until the Day Of resurrection.”
According to another Hadeeth:“Their [horses’] backs are glory and what is in their stomachs [offspring] is treasure.”
A horse in a dream may indicate a woman, a servant or a slave woman; going through a time of ease and of having needs met;marriage and comfort for the rider because he is riding over something else. It indicates something similar if the rider is a woman, because she is carried, and the woman’smaintenance is carried or borne by her husband, as Shaykh Shihaab-ud-Deen stated.
In my view, that applies if she dreamt that she was travelling on horseback or that she was riding as other women ride. Riding is indicative of travel because the horse is prepared for that.