Hopefully the DA files charges against this deranged woman. I understand she may be grieving poorly at the loss of her son but if the DA does not make an example by charging (and accept a plea), more people will abuse the law that is ripe for abusing.
Plea bargaining is the single most corrupting thing in the US judicial system. If you cannot convict on the original charge, then you should let them go. So many prosecutors over-charge in order to force a plea bargain. It looks good on their convictions record, whereas if they actually had to prove criminality, they’d not look so $#!+ hot.