[L] I found out that my sister was catfishing an entire YouTube chat and now she feels terrible about it

She told this to me a few weeks ago. She told me that she was in a youtubers live chat and was pretending to be a girl who was bisexual and not accepted by her mom for a few months. She told me because she used her main account that people know belong to her and that the youtuber just hit 3K subs and she is worried that people will start looking for her. She begged me not to tell our mom and dad so I didn’t tell them because I don’t want to ruin her trust in me. She is very afraid and I want to help her sweep this under the rug so she can keep living her life without fear. I am furious with her because I am bisexual but I know it’s not the worst thing. I just want her to be ok. She said the reason she did this was because her POS friend said “No one will ever love you. You piece of shit” and so she went into the youtubers chat so she would get showered with compliments. She is saying stuff like “I don’t deserve happiness after what I’ve done”