Jo
Last weekend was a nightmare for us, Indie was just bouncing off the walls and she was only allowed short 10/15 minute walks until her stitches were out which is why I was so relieved when Monday came as I had given up trying to stop her jumping. She was racing round the garden like a lunatic - it must be all that pent-up energy which is not being relieved by an on-lead walk. The cat had more chasing that normal.

I said I'd confirm the off-lead walking with my vet, not sure if I sent you that msg

but the vet confirmed that she could go off-lead as from Monday which she has done. Back to normal - worn out at night.
From looking at the photo, how can she possibly be a demon

Not long for you to now before she can release some of that energy.