这里的“单独一个人”可以有两种说法：alone或by herself.alone作为副词使用. "大卖场"可以译为hypermarket,supermarket,shopping mall等等. 整句话可译为： My mother often goes to the hypermarket by herself.But now she is shopping with my cousin! 或 My mother often goes to the hypermarket alone.But now she is shopping with my cousin!
