When I went out to see her / catch her she was still in the hedge, lambs trying to nurse with her lying down.
She didn't move away when I came close, then she didn't even try to move when I got hold of her, so that was definitely a huge deterioration since lunch time, so put her in the shed and called the vet out.
Her udder is fine, milk looks OK but not very plentiful, but she's got a temperature and is obviously thin and weak (still standing up occasionaly and eating though). No specific diagnosis but vet thinks the fly strike generally made a mess of her immunity and metabolism. She got shots of calcium, ABs and antinflammatories (and I was shown how to do them).
She inside now with cake, hay, fresh cut grass and various bits I know she likes (willow, hazel, ivy, comfrey). Will get some supplement milk for the lambs too.
Hope she feels better tomorrow.