Each person would have their own rapid rewards account so she can have her own not required but earn those points it’s free.
when you say young traveler I assume you mean over 11 years old if so you can go to the ticket counter and ask for a gate pass and they will assist you (assuming young isn’t over 18 years old) they will need your ID to create the pass and you would need the ID at security
be sure you arrive with enough time to go though security
also let this be a lesson for your kid don’t stress and make it a scary experience maybe arrive with extra time to walk around the airport so they can get used to it and if they want to explore let’s them with you behind them that way they might be able to do the airport on their own next time like see if they can find the gate without your help (even though you will be there this time)
-Blake
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