I could not find any connection to a Jewish heritage for Marla Maples.
Found.....
Marla Maples was born in Cohutta, Georgia on October 27, 1963 as an only child in a strict Baptist household.
And.....
Maples has retreated to a more private and deeply spiritual lifestyle. She recently hosted her own mystical radio show on Contact Radio, whose guests included astrologers and alternative healers, and in 2013 she released a meditative-themed musical album called The Endless, which featured the Dalai Lama and Deepak Chopra.
Now in her 50s, Maples spends her time meditating, practicing yoga and living an organic lifestyle. She also travels to third world countries and volunteers her time to charities.
https://www.biography.com/personality/marla-maples
So maybe Marla just wanted Tiffany to be well rounded so she could choose for herself when she grew up.
Thanks for looking. I looked last weekend and found nothing. Thought I might have overlooked something.
https://www.timesofisrael.com/trumps-second-wife-a-christian-keeps-kosher-and-shabbat/
(Oct 2, 2016 - Trump daughter Tiffany dating Jewish man ... Trump and his former wife actress Marla Maples, is dating a Jewish man. ... and both are involved with Jewish men)
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WASHINGTON — Donald Trump’s ex-wife Marla Maples is a Christian who keeps the Jewish Sabbath and eats kosher.
A profile posted Thursday by The Daily Beast said that Maples, a Baptist, regularly attends church, “but keeps Shabbat, eats kosher and studies Kabbalah.”
She’s into Kabbalah.