Global transfer will be of no use when having a Singapore Airlines Krisflyer card issued by Amex and moving to France.
It would be useful if she has a "regular" amex (blue, gold, plat). In this case, she would have been able to keep her track record with Amex (rewards, payment history...).
If she's looking for a FB card, she will actually have to start from the beginning. The best for her is to choose which card she wants and apply/get a referral. The previous answer has all the main info.