Stay with .45ACP, don't downgrade to a "ladies gun". It's a myth that women need to be coddled when choosing a firearm. In fact, it's very often counterproductive -- they'll buy an airweight revolver in .357 because it feels light in their purse, but the recoil (and/or the muzzle blast from the eensy weensy compensated barrel) is so horrifyingly bad that NObody wants to fire it.
At the shop I worked at, we universally recommended a 1911-style .45 with a 5 inch barrel (or 4.25 if they wanted to conceal it -- the ballistics get screwy with the new super short barrels) for smaller-statured people. When they learned how to properly use it, they couldn't be GIVEN a smaller gun. It's all technique -- weight is your friend, not your enemy. The gun you have sounds good as long as it's safe -- service automatics can be squirrelly.
Or, the one that NBN has in the Hopkin Green Frog thread. That one's ideal for personal carry (except he needs to lose the mil-spec hammer
)