Tell her the truth about Sexual transmutation, its purpose, its benefit and ultimately that this is the only way to be born again and the only door into Eden; the Kingdom of Gods.
Encourage her to start working with it. Be truthful, be realistic, let her know that it will not be all bliss; that she will encounter trials and ordeals when she begins the work of sexual transmutation.
You are in perfect position to introduce her to spirituality. Because you are already united with her in body and soul
Then both of you can effectively do the work. It is not going to be easy. Would you rather have her living in ignorance or to have her live in Truth.
But remember , that you can not do this with multiple partners and remember that once she begins , both of you will remain committed to each other through your journey of life. You also must be aware to remain committed to her , otherwise you are advised to discontinue the relationship in other not to enter into adulterous relationships. You can not be practicing sexual union and more importantly sexual transmutation if you are not hoping to be committed to one partner