Make her cry

昨天晚上女儿很得意地跟我说："Mommy， 我忘了告诉你， 我昨天（4月1日）差点make my best friend crying"。 我说：“how?”。 她说：“I told her that I'm not going to sit with her anymore (on bus)". she almost cried and asked :"why?" I said: "happy April 1st!". wow, I said:"你小小年纪就会把自己的快乐建立在别人的痛苦之上，Good!" what does that mean? she asked? "that means forget about it", I said.