Answer: Synthesizing antibodies.
Explanation:
A person should have a balanced diet which consists of fruits, vegetables, pulses and many more nutritious things.
Escaping from any of these food will cause problem in the body. A girl has skipped the protein intake inside the body by skipping the animal derived food ans is now depending on the plant source for the diet.
Sooner, she was ill and had infection in the body because there was lack of protein in her diet which lead to problem in synthesizing antibodies.
