Grandparents locked girl in bathroom  for six years

Summary:

What I have just heard about these awful grandparents is just appalling, like why would they do something like that. I think that they should have been stayed locked up for their entire life time because this is just not right. Poor little girl is probably traumatized from this awful experience I think that they should not even be allowed to have grandchildren. But my question here is how about the other people that knew, why did they just ignore the little girl, little kids may lie but still you have to listen to them.