Good luck to your wife and I welcome another woman shooter. If possible before you decide let her try a short barrel Colt 45 or something built on that frame with the short trigger and I think that you will find that it will be a great fit for a small hand. I can even manager a double stack para-ordance 45. Hope this helps.
My kinda gal.
Carol, leave the 9mms alone and get the .45 ACP model of whatever you prefer. The Sig you tested is going to be hard to beat, I think. Sigs have the best stock sight-picture and natural 'pointability' out of the box over any other pistol.
Like hd5574, I have a M1911-A1 Government clone. It's a 1990-vintage Springfield Armory with no modifications on it except for a 3.5 pound trigger and the 1911 original-style (straight-backed) mainspring housing.
However, if I were to buy another pistol now to *replace* my 1911-A1, it would certainly be a Sig-Sauer .45 ACP.
As far as throwing knives are concerned, I can't recommend them. I *do* have some well-balanced throwing bricks for sale that are quite a lot more effective.
Become and expert with them, and 'one-shot-stops' are commonplace, particularly from behind.