What is to be done for a woman who has not married despite many proposals, and are there Qur'anic verses for marriage?

Delayed marriage does not necessarily mean the presence of magic or a spell. A Muslim is advised to perform Ruqyah (Islamic exorcism), maintain regular remembrance of Allah (dhikr), recite protective supplications (tahsinat), and observe piety towards Allah. It is advisable to propose oneself for marriage to someone whose religion and character are pleasing. One should also increase supplication during times of responsiveness, such as the last third of the night, during prostration (sujood), and between the Adhan and Iqamah, for Allah the Almighty said: "And your Lord says, 'Call upon Me; I will respond to you.'" (Quran 40:60). There is no specific legal evidence for particular verses related to marriage, but it is permissible to supplicate for any need after reciting the Quran, in compliance with the Prophet's (peace be upon him) command: "Whoever recites the Quran, let him ask Allah by it."