she went downstairs and,stop at a shop which bought hair.这句中哪里错了?

she went downstairs and,stop at a shop which bought hair.这句中哪里错了?
我在做改错题,觉得and和逗号在这个句子中有问题,是用该把逗号和and跳个位置吗还是怎么改正.高手们请给我一臂之力吧!