Malala Yousafzai is a famous activist for education of young girls who the Taliban attempted to murder for her activism. Hence her comment "Boo 👎" on this young girl's post about skipping classes.
Young girl is just shocked she got called out by a famous person.
You'd get your ass to school, that's what you'd do. How are girls going to rule the world if you don't learn how? When we have 9 women Supremes (Justices of the Supreme Court that is) and 100 women Senators (with enough restrooms!) it will be just the beginning of parity for all the men-only generations.