First of all, the first point is her "small nature." Many characters in the book also agree with this point, because she is sarcastic and unreasonable. For example, in the book, because Baoyu made her angry, Baoyu went to coax her, not just saying a few nice words casually, or sending her something interesting. Baoyu not only coaxed her hard, but also coaxed her for a long time to calm down. We can see her "little girl" from it, and we can also see her heart from her performance. She makes herself look annoying, just pretending to be strong to cover up her inner weakness.
Secondly, she has a strong self-esteem. From leaving her father to Jiafu, she was "careful step by step, always worried, and refused to say more easily for fear of being laughed at"? She is careful everywhere, just to maintain her self-esteem.
Finally, we all know that Lin Daiyu is well-read, knowledgeable, talented and full of poetic temperament. But at the same time, she is also prone to feel lonely and afraid of loneliness. She is also very single-minded about her feelings and will not give up easily. Therefore, no one is perfect. She has both shortcomings and advantages, but she likes the role very much.