It's a very down and dirty process to get it transferred assuming that the data is not saved on a medium such as Gamecenter or on the app's own server. You'd essentially have to backup her device, extract the save file from the backup, make a backup of your own device that has War of Nations installed, then manually inject and modify the save file to work if your device (assuming the app establishes a save file using a UDID or ECID identifier). Once you've injected the save file and made the changes in your own iPad's restore, save the changes, then restore your iPad using the same restore point that you modded.
Sent from my iPad Mini via Tapa