I don't think she'd be handled any differently than before...and at minimum would be allowed to go standby later. But with the much improved same day change options now post merger I would suggest checking other options the day before and making an online change to a later flight if it's available. As a 1K this would be free if there's space. If things are really wide open, she could leave it all as-is and just make the change at a kiosk when she arrives in PHX if she's too late to make the connection.