If the kid does something ghastly, I think the mom can probably get away with saying that, especially if she was seen to be doing everything she could to get the kid help, but to no avail.
A kid is from a poor family. His single mom has been working three jobs to get him the psychiatric help he needs, but in spite of all her efforts, one Tuesday she hears that there has been a school shooting in the neighborhood, and the shooter has been shot dead by responding cops. It is her son.
She gets to play the "I wish I'd never given birth to him!" card with impunity.
Re: this doesn't answer your question but it pokes at the question yours points to
A kid is from a poor family. His single mom has been working three jobs to get him the psychiatric help he needs, but in spite of all her efforts, one Tuesday she hears that there has been a school shooting in the neighborhood, and the shooter has been shot dead by responding cops. It is her son.
She gets to play the "I wish I'd never given birth to him!" card with impunity.