I can't believe I've done this but I've just timed myself over 15 seconds pretending to push a pushchair at normal walking pace and at slow walking pace.
My investigation as shown that in the second picture if she had walked at a slow pace she would have gone the length of 3 cars and only 1 and a bit can be seen in the second photo (which is the first photo on this page).
If she had walked at normal pace she could easily do 4 queued cars which puts her even more out of the picture to the left.
Therefore she hasn't suddenly appeared out of nowhere, she had 15 seconds to get there.