How does Mama react when she learns Walter gave all of her money to Willy for the liquor store?

From the text:

RUTH stands with her face covered with her hands; BENEATHA leans forlornly against a wall, fingering a piece of red ribbon from the mother's gift. MAMA stops and looks at her son without recognition and then, quite without thinking about it, starts to beat him senselessly in the face. BENEATHA goes to them and stops it.