Have to agree strongly with Barnsley again here mrspnut. To suggest that NM shouldn't have escalated this matter I find worrying bearing in mind your work experience. Yes, DV professionals are excellent at what they do but I'm fairly sure that if you speak to one - and I work with both statutory and voluntary on a relatively frequent basis - they will express their sadness at the number of DV cases that go unreported. I do also feel that you undermine the work of SWs, midwives etc in your comment. Its very easy to have a go at these professions but the vast majority of practitioners are well trained, sensitive and have the best interests of mother and child (born or unborn at heart).
Maybe it would help this discussion to put the two options that the NM admin had in front of them:
DON'T REPORT: Basically, leave a woman suffering DV to continue her suffering and put her unborn child at risk (she may have had other children - I don't know), knowing that statistically she is not likely to report the issue herself but would love to get away from her horrible situation.
REPORT: Make professionals aware of the situation so that they can contact the lady and let her know her options (this is how i works by the way - they don't smuggle her away under a blanket to the middle of Wales), sources of help, support etc. There may be mandatory SS involvement as well, but this would most likely be done sensitively and with the wellbeing of the mother in mind.
I suppose there are alternatives. They could have emailed her with some helpline numbers but, to be honest, I'd imagine that if she's computer literate enough to go on a messageboard then she'd have known how to get those numbers anyway.
Ultimately, if you think it is wrong that the NM admin reported this case then you were basically expecting them to read the posts, sit back and do nothing. Just twiddle their thumbs and think about how sad it is. I certainly wouldn't be happy with that.