Hello You could book everyone on one confirmation number and if she is the only one who needs to be changed you can call the 800-435-9792 and they can split her off on to a new confirmation number you would then just pay a difference in fare if one exist. You could also book her on a separate confirmation to begin with so you can easily change it online but you would have to check in both confirmation numbers at the 24 hour mark or buy the early bird check in. You don't need a credit card to check in just a name on the reservation and the confirmation number. The only need for a credit card would be for a flight change (the difference in fare). If you know ahead ahead of time that school will be extended be sure to change it sooner rather than later so you don't have a HUGE fare difference. Happy travels Blake
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