بسم الله الرحمن الرحيم
Tell your sister to read Surah Waqia daily after Maghrib salah. In-shaAllah, she will not have to face any problem nor she will have to sell her jewelry. She will become prosperous.
Allah knows Best!
Darul Uloom Deoband
This answer was collected from the official ifta website of Darul Uloom Deoband in India.