Fifteen years old???

What is the significance of the “girls” age? This stood out to me for some reason? It’s just so odd? You meet a child who just lost everything to a fire & your first greeting to child is NOT “How are you doing?” Or “What can I do to help?” But “How old are you?” WTAF? It is so random! Is this a way to make her “story” sound plausible by using a teenager? Or should we expect more about the 15 year old? Or does this age coincide with the Charity she visited that was created by 15 year old girl? Maybe it’s nothing but clearly M practiced her spill numerous times with the edits & cuts. This is just nagging me for some reason. . .