THIS SCAM ALMOST GOT ME. (Please read)

So basically what happened was about a week ago someone told me that they would give a very good pet for free because I was nice. But, she said she wanted to interview one of my friends to see if I was actually kind, a week later me and my friend are online and she says she will interview! She says that I need to unfriend the friend so I do, then she says I need to trade her my best pet, so I was like "okay she can just give it back to me" but I noticed that my friend hadn't actually traded me, it was someone else with the same username, so I checked her profile and it was empty, unlike my friends, so I left and saved my self from losing my favorite and rarest pet. This was VERY clever and I almost fell for it. (I haven't been scammed in like 2 years). This was kinda annoying cause I told my friend I could trade the pet I would be getting could get us some pets we want!