It won't work anyway. Her actions after the fact demonstrate that she was of sound mind, well, at least in the sense that she knew she had committed a crime, and took steps to attempt to ensure she got away with it.
This isn't some mom drowning her kids in the bathtub, and then doing nothing in an attempt to get away with it.
She clearly killed her son, attempted to stave off discovery (text message to babysitter), disposed of him like trash (literally), and then told police a false narrative (when she last saw him/discovered him missing).
Try it Leilani, it has zero chance of working.
"Don't remember," my you know what.