if you still have an iPhone transfer to that phone and then move to sim
Now if you use the phone ! Back it up as your phone restore it as her phone. Put the contacts on sim. Restore back to your phone.
If you have a mircro sim (iPhone5) you may have to got to At&T (your carrier) who can take them and transfer them !
That is the only way I coukd think of. Here are many helpful members they may know a better solution