What Can You Do To a 18 Year OId That Is CyberBullying a 12 Year Old?

My Friend's Got Into Some Drama With This One Girl, and The One Girl's Cousin (Who Is 18) Is Threatening Her and Being Rude and Racist. This 18 Year Old Is Telling My Friend That If She HAS To Break The Law and Fight My Friend, She Will , For Her Cousin . And That My Friend Needs To GROW UP Because She Was Crying About Having 2 Family Members Die, and She Said : '' you little f*cking border hopin trick'' . and My Friend Said ''She Was Being Racist and Said Mean Things About _____, But _____ is Brown and Beautiful.'' And This 18 Year Old Said ''Oh, I Didnt Know Sh*t Was Considered Beautiful....??'' She Has Also Called Them Plenty Of Names.... What Kind Of Punishment Could She Get? Could My Friends Call The Cops?? Or What? Please Help...!!!