Nothing screams "my kid is going to turn away from truancy" like having a parent in prison.
When your cure only hastens and reinforces the bad behavior, your cure is bad and you should feel bad.
I would have no issue at all with child protective services being engaged, but sending an overworked single mother to jail isn't helping anything, it's just slaking bloodlust for punishment when people don't do as you'd wish.
If the goal is ensuring every child is equipped with an equal opportunity for education, then there are always better choices than hauling mom or dad off to jail. Can you seriously not see how patently absurd that is? It's a boneheaded move from top to bottom and she should feel shame for the rest of her life for putting her political muscle behind it. Educating every last child is important, but this proposed solution only makes things worse.
And that's what the issue is. It's not that there was intervention, it was this specific intervention is stunningly short sighted and entirely punitive.