You can't move apps through the settings, you can move files and the samsung guy said to move apps to dropbox or google drive. I tried the app link2sd (rooted) I was able to move one app with link2sd, but for all the other apps, i kept getting a failure. Your last option is to install a custom rom (rooted). you run on 4.1.2, I think your wife runs on 4.2.2, which has the option to move to sd. I dont suggest the 4.2.2 rom unless you really know what your doing.
good luck!!