Hi Miss Know It All

My friend and I play Roblox and I love playing with her. She is very nice and supportive. But my other friend scams bad. I try to talk to her and tell her to stop but she still does it. She even scams me. I have always been nice to her online but she has never been nice to me back online though as a friend at school she is nice why does she scam everyone including me. Why does she scam? Like she screamed at her party when she got something legendary. Is she my friend online or just a scammer?