Ok, I'm genuinely sorry to hear when a child dies from something, anything. People tell me you can't imagine the grief and pain, and I believe them. However, I do feel there are limits to the demonstrations of grief, and after some consideration I think this lady may have found them:

A grieving mother said on Thursday she plans to fight after her town set a deadline for her to remove decorations on the grave of her 9-year-old son or have his remains moved to a different cemetery.
...
Armstrong decided to bury the boy in a nearby public cemetery but found it to be "cold and raw" -- and so she covered the grave with mulch, white stones, fencing, plants, toys, Halloween decorations, solar-powered lighting, prayer cards and other objects.

Now, hysterical grief can cause people to do all sorts of things, but you have to draw a line somewhere. Turning your child's gravesite into a landing strip definitely sounds like that line has been crossed.