At risk of incurring the wrath of BB and probably a few others I just can't help but say...
.357 is a pretty stout cartridge in a full size 5" bbl S&W 686 like mine. It's even stouter firing it out of a 3" revolver. Not pleasant and not something I for one would put into the hands of the untrained, to be fired in a stressful situation, especially a woman (ducks for cover). Heck, I don't like it and I'm 230 lbs with big ole fat hands that can fire 40 S&W and 45 ACP all day long without missing a lick. Even my .44 Mag with 6" bbl and rubber grips is more pleasant to fire than a 3" bbl .357 with hard rubber grips.
Of course she could fire .38's out of it but depending on the lady in question even .38's out of a 3" revolver can be unpleasant.
Actually, in spirit, I agree with everything you have posted. Women tend to be less confident in their abilities because they don't practice as much as men do overall. Back before I hurt my neck I would stand toe to toe with you and fire any caliber of weapon you cared to play with all day long ... BUT ... that was after GC worked a long, long time with me. You cannot know how many times we went to the range and I was ready to leave after only one or two magazines through a couple of guns ...
With the wide array of firearms at our disposal in this day and time there is not reason why any woman cannot find a gun she is comfortable with and can learn how to shoot proficient. Drawing, aiming and firing under stress is a completely different animal though. EVERYONE (not just women) need to get specialized training as often as they can and practice regularly because drawing your weapon under the stress of an ongoing incident is NOTHING like drawing your gun at the range (or even playing around in competitions, although I can say that shooting in competitions has made me much more confident in my abilities to handle a gun under stress).