I remember JS saying this in the jail interview.
Jack: but, but I think it's important that you understand, because you haven't, like you're not getting this picture, that if, if these people were to somehow be to keep him in seclusion for the, a, until he's past the certain age that he's allowed to sort of filter back into the system, you understand that you will be charged with this? Because if they can't find the baby...
TPS: For murder.
Jack: If you know any way, any way that you can identify either where these people...
If TS and JS set this up, it makes no sense to bring up a murder charge. But they could have directed and or educated her on how to set this up. Jack seems to know a lot about seclusion and filtering back into the system.