Mom goes to the market every morning to buy groceries.
Tips
usage
菜 here means 'food ingredients' broadly - vegetables, meat, fish, tofu - not just greens. Separable verb: 买了菜, 买不到菜. In urban China 买菜 is increasingly done via apps like 美团买菜 and 多多买菜 rather than at a traditional 菜市场.