Isibel looks at his hand out of the corner of her eye, having no idea what he is planning to do with it, and she draws the shape of the berry and the leaves and writes down the color so she'll be able to tell the other elves. (She will have to come up with some way to get them to believe her, but perhaps she can just advocate general caution with the plants.)

She draws a box around the blank space under the berry drawing in case he wants to show her more poisonous-to-elves plants.