Why does God not answer the supplication of the oppressed poor woman, despite her life being completely harmed, while the oppressor enjoys his life?

You must repent to Allah for having ill thoughts about Him, as it destroys its holder. You must have good thoughts about Allah and complete trust in His wisdom, for His management of His servant's affairs is better than the servant's management of his own affairs. In every decree, there is profound wisdom. Allah may test His servant to elevate his ranks or expiate his sins. A Muslim must not fail this test. Allah loves to hear His servant's supplication and persistence, and He answers it if the conditions are met. The supplication of the oppressed is answered, as stated in the Hadith, but the response is not necessarily the immediate removal of the oppression; rather, it takes various forms: averting evil, fulfilling the request, or storing it for the Day of Judgment. Therefore, you must repent and submit to Allah's judgment, entrust your affairs to Him, be content with His decree and destiny, have good thoughts about Him, and not cease supplicating.