Apologies for not posting sooner again, laptop in for a health spa this past week.
Improvements have been made. Firstly, I should point out we are a completely non-agressive family so 'going in hard' is still low key. But that hasn't been necessary anyway. Now we are back into school routine, she has been great, playing with the kids, not grumpy with them and everything seems totally fine. Kids are feeding, taking bowl away etc., letting us do any telling off necessary.
I think there is something in the litter mates / pecking order scenario and it's just needing time to sort out and for us all to find our places in the set up. All the training efforts are as much for our benefit as hers I'm sure, she's whipping us all into shape.
I'll post a photo of the culprit later today.