LOST a silver necklace of enormous sentimental value

My daughter lost a silver flower necklace which was a gift for her 18th birthday (last month). It dropped from her neck whilst on a walk from Green Lanes, past Harringay station, Stationers Road then along the Park Land walk exiting at Crouch End, continuing back towards Hornsey station and back down HampdenRoad. If you find it, could you please contact me, she is so upset. Thank you