AwlArtist: If you made your own holster, it's a rule you have to post pics.
The Colt New Frontier is a great gun. No matter how great the gun, it's the shooter that makes the difference.
There are likely classes near you that cater to women shooters. It would be a good idea to check one out.
ProxyBoy: It is the nature of internet forums that the posts become repetitive and or miss changes in the thrust of the thread.
But the basic comments are sound. Get instruction, flinching seems to be the problem, and taking up the "slack" in a trigger is bad practice.
My own two bits is that you should get a .22. A Ruger MK., a Browning Buckmark, or a Beretta Neo would be great choices. Let you wife pick which one she likes.