Why not? By that time it was a neglected gravesite, was it not?
Are Catholic graveyards prone to falling into disuse and disrepair to the point that no one knows it’s there anymore, annalex? I note that the graves of I believe 13 nuns from this home were relocated from the graveyard at the hospital located about a mile away in 2001, when the hospital closed.
They could have just sent them to be incinerated for fuel at a local hospital with other medical waste and avoided burying their tiny bodies at all.