The child reportedly said that. I wonder what 'with an accent' meant?
https://www.thesun.co.uk/news/8737819/madeleine-mccann-morocco-petrol-station-sighting/
So if she didn't say it, they stood silently together, a little distance apart, still strange. I would presume she meant an English accent.
More about the sightings -
Marie Olli, a Norwegian woman living in the Spanish town of Fuengirola, contacted the police on 10 May 2007, claiming she had seen a girl matching Madeleine's description in a petrol station in Marrakech, Morocco. The girl, who was said to have appeared sad, was allegedly accompanied by a man in his late 30s.[21] At about the same time, a British tourist reported seeing Madeleine near the Marrakech Ibis hotel.[22] Although Interpol subsequently discounted these sightings, officers from Leicestershire police remained in Morocco for some days afterwards.[23] A Spanish tourist saw a girl resembling Madeleine as she drove through the town of Zaio in northern Morocco at the end of May.[24] Attention switched back to Morocco on 4 June, after GCHQ in Cheltenham picked up phone intercept messages in Arabic referring to "the little blonde girl", a German man, and a ferry from Tarifa in Spain.[25]