I'm not sure I would go through all of this trouble and expense if the recoil is your main concern. I have both a 19 and 23 and if I close my eyes and don't know which gun I am handed I can't tell which is which by recoil alone. The difference is minuscule. For the price of the conversion kit and the extra mags I would look into getting her a gun she is more comfortable with in a larger caliber.