Ivanka is Orthodox. I don’t know if Tiffany is following Kabbalah like her mom, but it is mysticism.
This is the esoteric teachings of Theosophy completely alien to the spirit of the Scriptures, because the Divine truth contained in the Holy Bible, seeks the salvation of all mankind. Therefore, some secret knowledge cannot be in issue.
Not in secret I have spoken, not in a dark place of the earth I did speak to the seed of Jacob, ‘ye seek me in vain.’ I am the Lord that speak in righteousness, speaking the truth’ (Is.45: 19).
The Word of God is a revelation of the way to our salvation. Scripture remains secret to the extent that when we begin to read it, we do not cleanse the conscience from sin, are not free from prejudice, false ideas and prejudgments. Only to the degree of spiritual perfection is a person able to put into himself the high spiritual contents of Scripture. The mystery of the Lord - is to those who fear Him, and His covenant He will show them (Ps.24: 14).
The claim by the Kabbalists themselves about the existence of the book Sefer Yetzirah from the time of the patriarch Abraham is mythical and has no evidence. On the contrary, the presence in these books of the philosophical ideas of late antiquity (Gnosticism, neoplatonism, etc.) completely refutes this view.
https://www.christianforums.com/threads/orthodoxy-on-kabbalah.7777113/