Song only played two LPGA events in 2010, missing the cut in both. Instead, she focused on the Futures Tour. It was a good decision: Song finished third on the tour's money list and earned a full card for the 2011 LPGA season. The highlight of her season was back to back wins in early June. Song had 6 other top tens besides those victories.

Song did not have a good season on the LPGA in 2011, with her best finish a tie for 38th. She wound up 126th on the tour money list, meaning she had to return to Q-School to try to regain status on tour. Remarkably, she was brilliant at Q-School, leading the entire field almost the entire week, sometimes by as much as five shots. In the final round she was caught and passed, but still finished second to secure full status on tour in 2012.

Song made less than $20,000 on the LPGA tour in 2012 and finished 129th on the money list, not good enough to maintain status on the LPGA. So she returned to the Symetra Tour in 2013, where she played quite well. She won two events, made nearly $40,000, and finished 4th on the money list, which earned her full status back on the LPGA for 2014.

However, Song struggled with injuries in 2014 and did not make a single cut all year. She took a medical exemption and maintained full status for 2015.

In 2015, she once again did not make a cut all year, and returned to Q-School. As usual, her form at Q-School was impressive, and was tied for the lead after the first day. She hung in there for a few more rounds, but faded with a 76 on the final day and found herself in a playoff for the final full card. Alas, she was the only one of the three in that playoff to not get a full card, and fell to category 17 status for 2016.

Christine struggled again in 2016, missing most of her cuts. She did set her record for most money earned in a season at slightly less than $25,000, but that was nowhere near good enough to get better status on tour. She also missed the cut at Q-School, so she wound up playing on the Symetra Tour. At the end of 2017, she lost her LPGA status and played on the Symetra Tour. There are no recorded results after 2019, however, so she has probably retired.