Tell her the importance of education. A person who has good education can have good success in life. If the person is weak in studies, let her to work harder. It will always benefit yourself if you choose hardwork and determination. However, she may find it difficult, so it would be advised that you pay some special attention to her, and help her in studies. Later, with good support and determination, she could be able to work and study hard on her own.
Hope it helps. ✌️