HT1451 i have and can find all duplicates in my library - after i find them is there a way to delete the other than one at a time
The only way they would all come over is if your wife had automatic downloads turned on in her store settings on the phone before she downloaded the apps. A popup for this option also comes up when you first sign into an apple id on the phone in the app store. If she didn't have that setting turned on, she'll have to download them one by one.
She could also try to sync them over from a computer that has itunes on it