my sister is ruining my reputation on minecraft

sorry if this is cringe cause i'm so fucking mad rn

my idiot sister has been hogging --->*OUR*<--- nintendo switch since the start of the year and cries whenever my parents try to make her put it away (she stayed up until 4:AM once!!!). and she's using MY microsoft account and MY nintendo switch online subscription to join a server to play with her "friends" (again, she's using --->*MY*<--- microsoft account!!!!). she has her own profile and she STILL uses mine to play with her "friends" (i dont even know half of those people!!!!!!) i keep asking her to let me play and she just gets mad and says things like "im making YOU friends cause you're so lonely!" or "i'm telling mommy you're getting mad at me" i cant take this anymore. she's been ruining my reputation on the server she's playing on. how do i stop this????????????????