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She admitted that social services had probably made the right decision in removing her first 13 children because of neglect, but said she had 'calmed down' now.
I think the answer may lie here.
She is already pregnant, alright give her, her wish, let her keep this one, but then keep a very close check on how she brings this baby up.
At the least sign of danger to the baby, social services should move in, she should then be arrested for neglect, tried and if convicted, she should serve a long prison sentence, taking her past record into consideration.
In hindsight this should have happened after baby 2.