No, but it's briefly mentioned within the first five minutes of the episode about lack of electricity in a refugee camp and how criminals come out at night. Elizabeth mentions that then the women are terrified to go to the bathroom at night implying that sexual assault is taking place.
Rape is not directly mentioned, but it's implied as it's said of Nigerian school girls being held captive that they are now wives to fighters. The same may also be said of the young woman who was given as a wife to a terrorist leader.