The narrator cradles the white trainers as though they are her missing daughter.
The narrator has no control over her daughter, so she locks the shoes in the cupboard instead.
The narrator keeps the trainers safe. She wishes she could have kept her daughter safe from harm.
The narrator criticizes the way her mother used to dress. She thinks she looked cheap.
The women in the family all have the same sort of feet: small but strong.
The narrator admires the shoes because they have never been worn. Like them, a tiny baby might be described as perfect and new.
The narrator's mother's shoes are worn out: they show she was vain and old.
The simile comparing the laces to sweets shows that the narrator is sad that her daughter is no longer a child, and perhaps regrets the passing of her own innocence, too.