Yi earned non-exempt status at 2007 Q-School, finishing tied for 25th. In 2008, she played quite a few events for a conditional player, her best finish coming at the Safeway Classic in August, a tie for 11th. She would not make enough to earn exempt status, however, and would return to Q School in December. She failed to improve her situation there, and would thus again only have limited status for the 2009 season.

By and large, Yi had a so so season in 2009, with one glaring exception. At the Jamie Farr Owens Corning Classic, she was a woman on a mission. In round 3, she shot a 61, one of the best scores ever achieved by a Korean. She struggled a bit more in round 4, and was unable to birdie one of the final two par 5s. As a result, she ended up in a playoff with Morgan Pressel. But if she was nervous, it didn't show: she won that playoff for her first career win!

2010 was a far weaker year for Yi. Her best finish was a tie for 21st early in the year. She did not make enough money to finish in the top 90, but fortunately, thanks to her win, still maintained full status on tour for 2011.

In 2011, Yi played a few events, but none after June. She continued to maintain status on tour due to a medical exemption, so presumably she was injured sometime after her final appearance of the year.

Yi played in just four events in 2012, missing the cut in all four. She still maintains a very low standing on tour thanks to her previous Farr win.

She played three events in 2013, but again missed the cut all three times. She also played two Symetra tour events, but only made one cut and earned just $336. She also missed the cut at LPGA Q-School, and thus retains marginal status for 2014.

Yi only played one event in 2014, the Kraft Nabisco, and missed the cut. Since then, Yi has played mostly on the KLPGA with limited succcess. In 2017, she played around a dozen events, but made only one cut, finishing 65th. It doesn't seem like she played in 2018 and may have retired.