Gathering additional information about the situation may be very helpful. Some articles that may help you prepare what to say to your daughter are Stop It Now!'s Understanding Sexual Behaviors in Kids and Talking to Children and Teens and Talking About Sex and Sexuality: A Resource for Parents from Planned Parenthood. Prioritizing your daughter’s need for information regarding appropriate sexual behaviors and personal boundaries will provide you with some next steps. She will also benefit from guidance from you regarding peer pressure and healthy sexuality. She will benefit from your acknowledgment of how frightening the experience must have been for her, as well as your support and comfort.

It must have been very scary for her to feel trapped by the other child’s physical force. It seems that your daughter started out playing this game, possibly knowing that it was forbidden territory, but then quickly found herself way out of her depth. The behaviors you described are very concerning.