Anniversary mums death

Today was the anniversary of my mums death thirty nine years been quite upset went to the allotment then a drive to the graveside to find what I think was that the head stone had been vandalised it has a massive crack on it and something been thrown on it and the item I had placed at the side for flowers was no longer there got me thinking how could anyone do this on the way back took pic of post box thanks to busboy for everything