i need some fanpop ppl help!!

ok, so this past week me and friend were in a fight bcuz in the hall it was really noisy and i dicho something to a frined that to her sounded like "Your hair is ugly" o something like that. So like the día after we made up this really nosy girl name Sarah came up to me and dicho "Oh my god u did not have to make fun of Cidnee's hair!" (my friends name is Cidnee's) and one its none of her busniss and 2 were not fighting anymore!! then she told me this a 3 days later but still acted like my friend, just blaming me!! confusing i know! what should i do about Sarah!!??? HELP!!