Tell her that it won't kill the baby unless she rubs mice/rats/rabbits all over it. Or unless the baby picks it up and starts whipping it around.
Plus come on, common sence are you REALLY going to let a 1 day old (1 month old, anything under how many ever yrs old) hold a 9ft how many ever pound snake?
And are you REALLY going to leave said snake ALONE with the baby.
Edit: The baby is more likely to be attacked by a cat, or dog than a snake. Unless of course as mentioned above you rub mice/rats/rabbits all over him/her!