Why Doesn't Lindsay Clancy's Judge Get Any Say?!

If Lindsay Clancy is convicted of first-degree murder, a Massachusetts judge has no room to weigh in on her sentence at all. 
The charge carries mandatory life without parole. Not the illness, not the medication, not the wheelchair, not a single fact about who she was before January 24, 2023, when Cora, five, Dawson, three, and eight-month-old Callan died at their Duxbury, Massachusetts home. The judge doesn't get a say. Neither does the jury, once they've reached that verdict. 
Lindsay is pleading not guilty by reason of insanity. She's a former labor and delivery nurse. Prosecutors say roughly three mo...