"A Mormon Jew? But that like, defies the laws of, like... thermodynamics"
She's not the only one to question this peculiar fluke of nature, so I thought I'd give a go at enlightening the puzzled.
My parents are both mutts. Which sorta makes me Mutt 2.0. On my mom's side, her dad was half-French half-Irish, and her mom is half-Cambodian half-Chinese. My dad's side is composed of my half-Spanish half-German grandfather and my half-Mexican half-Navajo grandmother. All of this adds up to me, compiled from eight equal 12.5% chunks of ethnicity. Lord Muttious Supreme, Ruler of Mixed Race, Duke of Cornwall. Each of these ethnicities came with it's own accompanying traditional religion. So my parents to decide me with no religion at all.
My paternal grandfather, a descendant of conversos, despite marrying my Catholic grandmother, remained a practicing Jew up until his death. The discovery of this part of my heritage sent me on a journey of seeking and learning that eventually led me to honoring my bloodline and rekindling the faith of my ancestors. (First however, my dad's mom *did* attempt to raise me Catholic, but after I got kicked out of three different Sunday school classes for asking too many questions, she gave up.)
So I embraced Judaism. And thought that was it, that I had found my faith and I was done with exploring other religions.
Enter the Church of JESUS CHRIST of Latter-Day Saints. I emphasize the words 'Jesus Christ' because if you've ever seen the logo of the Church, you'll know that the words "Church of" and "of Latter-Day Saints" are in regular, normal letters, with "Jesus Christ" slapped in the middle in big, huge 'What now, bitch?' CAPITAL letters. See what I mean?

This is amusing to me because I know this is one of the subtle ways the Church flips off/defends against those in the Evangelical community that are adamant that Mormons aren't Christian. "Look here you freaking little fetchers; its says 'Jesus Christ' right flippin' here morons. Suck my balls."
I'm digressing. Let me go back. Starting when I was 13, my best friend Laura had started taking me to her church, a Unitarian Universalist church, where in religious education class, you learned about all different kinds of religions instead of just one. That class helped build my foundation of knowledge of Judaism, and also introduced me to the LDS Church. I read and studied about the church, and despite the obvious contradictory flaws between Judaism and the Church, some of it really made sense to me. I accept Judaism as a whole, and also accept bit and pieces of LDS doctrine as well. I am baptized as a member of the church and regularly attend Sacrament Meeting. I am a Mormon Jew. Or a Jewish Mormon.
So while it may seem strange that I consider myself to be both Mormon and Jewish at the same time, it's entirely possible and no, Michella, it doesn't violate the laws of thermodynamics. It probably violates string theory, though.
