To put it simply, school is very protective in a number of ways. Of course, it's where education occurs, and this is going to be, in the long term, the girls' chance out of poverty.
However, in a place like Kenya, which we've studied, the girl being home rather than going to school every day means that, first of all, she's accessible for coercion, for something like female genital mutilation, which normally occurs at a particular time of the year. When the girl is home, now there are a number of social issues that lead to her being taken away to have a traditional procedure. Where the president of the country, President Kenyatta, has said that they want to put an end to FGM, the accessibility in a rural area, the message doesn't penetrate.
It's similar for the issue of child marriage. When the girl is home rather than going to school, the monitoring that normally takes place, the social interaction, someone to report to, is no longer readily available.
Last, with disruptions in the health system, the child is not getting the normal points of contact that you would expect regularly.