“What was the author’s purpose of having Macabea’s death be so sudden, and so insignificant?”

The ending of the book has Macabea die from a Mercedes. Throughout the book, the author keeps demonstrating how insignificant Macabea is, how ugly she is, poor she is, in poor health, mentally slow and ignorant etc. Most of the time, deaths in literature that are emphasized are usually significant, but hers was so sudden and she was marked as insignificant. Why have her die at all? The symbolism, reason, and descriptions around her death are interesting and difficult to decipher.