How does the author use foreshadowing in 'Night, Mother?

In the opening scene, Thelma is getting a packaged snowball cupcake from the cupboard and complains that the coconut is falling off. "Why does the coconut fall off?" she wonders. This is clearly symbolically foreshadowing what is coming. She doesn't understand why she is losing her daughter to suicide - why Jessie is "falling off."