I think as long as her name is listed as one of the parties on the reservation you can do it. That has been my experience anyway. My sister has received email postcards with a PIN & I've made our ressies using it. Of course, she has always gone on the trip with us so the PIN was not really transferred to anyone. I think you'll be fine to make the ressies altho' you may have to explain it all to the CM when you call.