My cousin claims that she is in love..?

My cousin thinks that she is in love with her boyfriend of only one month...I think a little less. My cousin is a freshman, and her boyfriend is a junior, and about two weeks into the relationship, because she beleived she was in love, she lost her virginity to him. All she ever does is talk about him, and her friends, and me are being annoyed by it. I keep telling her that because everything is so perfect it's most likely infatuation, and she keeps saying it's love. I'm sick of hearing this, because I fell under the spell of truly believing I was in love with my ex whom I was on and off with for about 3 years. I know that it was all puppy love, and last year I snapped out of it. I dont want this to happen to her and she refuses to listen saying that it's love. btw. idc. I go to an all girls school, and I think boys right now are immature, I was deciding to wait until either 16 or until college to start dating, because I know I am not mature enough for a relationship, and if I can spot my cousins immaturity then I definitely know what is going on. My cousin thinks that oh la dee da, the world is so great and wonderful, and just has immaturity written all over her. How can I get her to realize that it's infatuation and not true love.? please help?