Oh thank god!
I hundred percent would have approached her, in a very gentle way. I got lost at age 5 many, many years ago but I still remember it clearly. I was very frightened but had the nous to approach two old ladies sitting together. They stayed with me and I still remember my frantic mum running towards me, I even remember what she was wearing even though it must have been circa 1966.
I approached (again extremely gently) a young crying lad in a shopping precinct who couldn’t find his mum, I stayed with him at the spot I found him, a while later his mother came and was very grateful.
Because of my experience I’ll never ignore an obviously alone or distressed young child.
This could easily stay with her forever, poor love.