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Firstly, you need to sit her down and ask the reason behind this action, if both of you agreed not to get involved in jeru trap before the courtship started, though i doubt if both of you reached a consensus never to have jeru trap during your courtship. Also, this might be caused by a lot of reasons. It might be due to friends' pressure from her side, fear of getting married to an impotent man, etc. Whatever the reasons, it doesn't justifies her action. Kindly ask her some questions such as, what if she gets pregnant, disease, etc.
If both of you have an authority figure(s) that you are accountable to, try and inform the person. However, if she still insist, then break off from the relationship.