If she’s willing to go, having her also attend RCIA would be an excellent opportunity for her to know what is being taught. Tell her that you will dedicate a certain portion of your week to discussing with her and or her minister the points you are being taught in RCIA. This should help her to know that you are not going forward on this blindly, that you are open to her (name removed by moderator)ut and the (name removed by moderator)ut of those whom she most trusts in matters of spirituality.
Then, pray, pray, pray to the Holy Spirit that you be guided in each and every word you speak on religion from here forward. This will be an incredible time for you to test your Theological virtues of Faith, Hope and Charity (Love).
Have Faith and Hope that Christ Loves you enough to bring you and those you Love to see Him as fully as possible in this live and with the veil lifted in the next.
Know also, that the evil one hates it that so many are coming to know and accept the Truths of the Church, so you are likely to find yourself under spiritual attack. Therefore, you will need Faith, Hope and Charity in all areas of your life. Give your life fully to God, submitting fully to the path on which He leads you.
God Bless,
CARose