How do I get my friend to understand her online boyfriend is NOT her real-life boyfriend?

I have a good friend whom I talk to about every day, hang out with, etc. etc. I am trying to look out for her best interest here.

She met this guy on Facebook named Andrew. We are in Pa and supposedly he is in Ca. She says he drove past her house twice in a white car, driving to the NY airport to go to Italy. Already that makes no sense! He looked at her for "4-5 seconds," did not say anything, and just drove away.

Anyways, she has bought a wallet and 2 shirts, one for him and one for his twin brother. I do not know how she will get it to him...but anyways...she said today this kid we knew from school told her he still has feelings for her. She says, "I don't want him! I have Andrew!" HOW do you HAVE him!? You never see him or hang out with him. I mean really. She says he is her "real-life" boyfriend.

I do not know if this should matter or not at all but my friend tells me she has autism. She is fine for the most part, at least as much as I can tell, I mean I am only trying to look out for her. I doubt honestly that if Andrew met someone, he'd say, "No, I have Amy." (If this matters, she is 18 almost 19 and he is 21) I do not know the best way to explain it to her. Every time I try, she gets pretty mad or annoyed. Any suggestions? Thanks! :)