Originally Posted by vintagepilot

1. Generally not, as you are one of the travellers. But you can also be named as a third party nominee on her account so that you can manage it directly. We did the same, booked the outbound online with my partner's voucher and I did all the legwork thereafter including rebookings, re-routings and eventually cancellation myself. Equally, you could book the return online if you want and then call up to have it vouchered in the morning. This may not be the best plan if you are going west, but usually better in taxes if you are going east.
2. You need to call an office that is open at the time - although as said, you will be put through to a 24hr call centre.
3. Fine - in the same way as your Amex was used against her voucher in the first place. We have also changed a booking where the refund went back to a closed card and the new fees were paid on a different card altogether - albeit still an Amex.