She is 15-years old (born May 2002) from Las Vegas. With her run from qualies to QF at 100K Tokyo, Naomi cracks the top 500 and passes Marta Kostyuk as the highest ranked 2002 girl.
First came across Naomi's name in late 2015/early 2016 as a 13-year old when she reached SF or better at 6 junior tournaments in a row. She stagnated for the rest of 2016 and actually stopped playing juniors as of October 2016.
From her Tennis Recruiting page, it appears Naomi has turned pro already, which would help explain why she stopped juniors already.
She has really come alive in her last 3 pro tournaments in Japan, reaching 25K Makinohara QF, 25K Hamamatsu SF, and now 100K Tokyo QF, coming through qualies on each occasion.