As soon as she left, we ran to her and apologised. After that, we never made fun of her stammer again. We helped her every day to improve, and little by little, her speech got better.
Eventually, her stammer was hardly noticeable. She became our pride because we helped her face her challenge together. She started smiling more, and soon, she had the most beautiful smile we'd ever seen.
We only have to give a little to get someone's smile.