Definitely arrange some meetings at school and discuss possibilities that might have contributed to the shift in her behaviour ( are there any pastoral staff members, counsellors, mental health team that can support her ar school) Perhaps he has some issues with peers, maybe private child therapy in the meantime when waiting for the referral.
My 6 year old is like this but at home not school but when she's not in school on half terms her behaviour is amazing so it's school that's causing it we have been told we have to go on parenting classes and they won't do anything with her till she's 8 it's crazy as I can't cope with the behaviour esp3cially round my 6 month old but school haven't been great I just came on to say your not on your own really xx
My almost 7 year old is the same, no known reason... There's been discussions about getting him assessed but it can take 12-18m... If you need to vent at all drop me a message. You aren't alone ❤️ xx Sorry to hear about your loss 😢 xx