I completely agree with this. I want to add something though. Something like rape (especially if it is recent) can make sex difficult, for both partners. She may not be ready to have sex, and may try to hide it. There also may be times where she has flashback before, during, or after having sex. So if you two plan on becoming/are having sex she may have flashbacks. This does not mean she thinks you are capable of this, or has problems trusting you. Remember, it is most likely the act that is causing the flashback and it will take time for her to overcome this.
This was an issue with my ex boyfriend and I. It was hard for him to understand that he wasn't the problem, it was just having sex that was the problem for me.
Try your best to understand this, and if it does happen please, for the sake of her emotions, do not overreact. Just try to listen, and be there for her. I trust you will seek help for yourself if it becomes too difficult for you to cope with.