I doubt all she will receive is 'a few tests and not much more'. She'll be incarcerated in a hospital or prison under whatever mental health laws California have.
It's sickening. Take the baby to the hospital or friends house or anywhere safe and walk away. Don't hurt or kill children.
She deserves to die the same way she killed her kids.
Clearly you don't understand mothers with severe mental health problems. If she was in her right mind I'm sure she would've done this, but those who are psychotic don't think with a rational mind..