One comment that I would like to add about the revolver vs. semi automatic is that most revolvers, especially the smaller ones have very long, hard pull triggers and this can make them more difficult to shoot accurately.
My wife chose a Glock 26 as her first carry and it was a toss up between that and a Kahr (cm9 or cw9). Early on she had tried a S&W 642 Airweight in .38 spc and had a horrible reaction to it that left her with a numb hand for a week. Now, about a year later, with more experience she has tried it again on several occasions at our local range and is even considering buying one.
Another carry consideration for females, one that my wife is constantly pointing out, is clothing. A very popular carry option is IWB (inside the waistband) holster. Most of the pants that my wife wears don't have belt loops and carrying IWB would leave her pants at her ankles.