I know that Xxed. But what would you do, if you were the mother? Seriously? The urge is almost primal to protect your child.
OK to turn my post around. The mother has two choices, be open or hide.
For the child, best case scenario if mother is honest. Social services are able to support the mother and help her to be an adequate mother to her child. - Or - child is removed from potential abuse or neglect before it happens and hence is able to have a happy life brought up in a stable home.
Worst case scenario if mother is honest - SS remove child unnecessarily, child is denied chance to have relationship with mother. But is probably young enough to be adopted and hence have stable (if not totally free from the issues brought on by being in care/adopted in itself)
Best case scenario if mother hides - child has totally normal upbringing. But considering it's known there were fairly serious problems in the past and serious problems don't tend to disappear of their own accord in the four years betweentimes, it's unfortunately unlikely that this would be the case. So instead I'd say best case scenario is that the parenting might not always be great but it's good enough. OR if the parenting is truly terrible that it's picked up on early enough that the child can have a good, stable life in care and have a good chance of being adopted.
Worst case scenario is of course that the child suffers horrendous abuse which is never picked up because the mother has tried to hide, OR that abuse is discovered after it has been going on for some time and hence the child suffers before being removed and/or is too late by the time they are removed to be placed easily with a family. OR, that the child is removed later despite having a good attachment to the mother and this is extremely distressing for them both.
It's clear from this (speculation, obviously) that it would be overwhelmingly better for the child for the mother to be open and honest, but as I said earlier, how on earth do you convince a mother terrified of losing her child to the point that this clouds all other judgement that this is the case?