核心问题
You and the girls may go, or you may send them by themselves, which perhaps will be still better... (Pride and Prejudice, p.2) [原译]你让女儿们自己去得了。要不然你和她们一道去，这样做好些。……(《傲慢与偏见》，太白文艺出版社，1994，p.2)。 which 是指代“You and the girls may go”（你和她们一道去）吗？
词典解答
从语法上看,which 显然指代连接词 or 之后的分句:you may send them by themselves。 [试译]你和女儿们一起去吧,要不你就打发她们自己去,这样或许更好些……