Advice. do you think i went to far. ?

i was at my sisters school today and they were out a recess. thease girls that are 5 th graders ( my sister is a 4th grader) were like get off the bars, im gonna use them. my sister and her friends wouldnt let me tell the 5th grade girls to knock it off so i asked my sis for there names and she wouldnt give them to me. so when i left her school i told the office that 2 girls were being jerks to my sis and her friends. next thing i know they called one of my sisters friends down to ask them the name of the two 5th graders. she didnt tell them the name. did i go to far. i dont want my sister to hate me or anything but i dont want her to get bullied . i dont know if its just because im on my period but i feel like really bad and i dont want her to be mad at me. my emotions are high and i just down want to overstep my boundry. what do you think?