зачинщица bedeutet auf Englisch

firebrand▼(argumentative troublemaker or revolutionary)
noun
[UK: ˈfaɪə.brænd] [US: ˈfaɪər.ˌbrænd]

instigator [instigators]▼(person who intentionally instigates something)
noun
[UK: ˈɪn.stɪ.ɡeɪ.tə(r)] [US: ˈɪn.stə.ˌɡe.tər]

ringleader [ringleaders]▼(person who starts and leads a disturbance, a conspiracy, or a criminal gang)
noun
[UK: ˈrɪŋ.liː.də(r)] [US: ˈrɪŋ.ˌli.dər]