Julie originally crossed the plains with her parents in 1848. She married Archibald Sullivan in 1850. Sometime shortly after, they moved to San Bernardino California. She had her first child there in 1853. Sometime between 1857 and 1859 the family traveled back to Utah. Additional research is needed to verify which company the Sullivan family came with. However, they could have traveled with the Joseph Lazarus Matthews Company of 1857 (her father's company) or she could have traveled with the company her sister, Mahalia Holladay, traveled with in 1858 (Henry G. Boyle Company).