Thank you Scribbles
Well, she made it through the night. Breathing on her own, but still in O2 tent. Non-responsive, apart from blinking, so that's not good as it indicates possible brain damage due to being oxygen deprived when she stopped breathing during surgery.
She's on iv fluids, antibiotics, anti-inflammatories and being tube fed! Her poor little body 
Hopefully, the nutrients will increase her strength enough to pull through.
I'm visiting her this afternoon, but only for about 5 minutes as she can't be out of her tent for long. I'll take her 'skateboard' * with me, just to see if there's any response at all.
* Her skateboard is an empty paper carrier bag that she pounces on and skates over the kitchen tiles! She also likes the challenge of trying to open it (it won't co-operate and keep still!) and hide inside it! She also loves the crackling noises it makes.