The poor child. She hates school for some reason and noone is listening to her.
I was told by CAMHS and school staff that I should manhandle DD2 into school if that's what it took to get her in. Luckily I had the knowledge, skills and confidence to challenge this and other professionals backed me up when I said that would be dangerous and inappropriate.
I know a lot of parents who have been told that they need to force their desperately distressed child into school, that the child is fine once there and they are the problem, that they will be prosecuted if they don't force the child into school or that they will be investigated by social care and have all of their children removed if they don't send the child to school.
On top of this, the children, who look fine in school, are in meltdown at home, trashing the house, being physically aggressive to their siblings, refusing to get dressed, staying awake all night, clinging onto doorways and running away They are severely distressed and nobody is listening to them. Their behaviour is put down to inadequate parenting and it causes huge damage to the whole family.
It absolutely is abusive to treat the child in this way but, at the same time, this woman may be (loosely) following professional advice, have no idea of how to handle the behaviour, have no understanding of the reasons behind it and be terrified of losing both of her children.
It is no excuse for slamming a child into a gate but, maybe if you'd seen it, you would have seen a parent grabbing a child clumsily while trying to keep hold of her younger sibling, to prevent her from running into danger.