I am so sorry to hear this. I have always understood that the age of criminal responsibility is 10 in the UK. Was this reported to the authorities?
Any child who commits a crime such as this needs family intervention by social or other services who I assume woukd be involved.
Hopefully you are not too faraway so you can help support your granddaughter and as for God I have no religious belief so cannot help , sorry, but I wish you peace of mind and recovery from this dreadful situation.
Good Morning Wednesday 24 April 2024