But, she goes on to tell about how her MIL let her older daughter eat an ice cream cone, with ice cream that contained tree nuts, in front of her younger daughter, who had none. The MIL then says something like "well, she needs to learn that she can't have everything she wants". Classic narcissistic parenting on the part of g'ma, trying to pit the girls against each other and ignoring mom's wishes. All nuts should have been put far away, even residue can transfer (from surfaces, hands, dish towels, door knobs, toys) and cause a reaction.