help finding story about a potential cannibal

hi guys! i've been looking for this particular story for ages. It was regarding an ice cream truck with a woman who was extremely suspicious and very pushy with the person in the story (who had a best friend whos birthday it was i think) and gave them flowers. she also ended up slashing the tires of their car (?) and accompanied them to a local ice cream truck where she told the op's friend how much she wanted to eat and cannibalize her just like how she 'ate her daughter'. and then when they ran away freaked out, the woman got into the ice cream truck they had just left with the man running it and drove away. Could someone help me find this? thank u so much!