In pages 87 and 88 of the birchbark house, how does mama know that pinch is really the one who ate the berries?

Explanation:

Pinch’s stomachache made Mama suspicious. The juice marks on his hands and lips were proof.

If I remember correctly

hey kid learn to actually put time and effort into your school work and maybe you would get higher grades and not have to come on this website and beg for answer's

maybe i could if you provided more information, such as a image of the text? (;