On November 16, 2008 (2008-11-16) at Jewels 1st Ring, Ishikawa debuted with a victory over Sumie Yamada via submission (triangle choke) in 62 seconds.
[7][8] Fighting as a freelancer at Jewels 5th Ring on September 13, 2009 (2009-09-13), Ishikawa defeated Asako Saioka with a rear naked choke submission in less than 90 seconds.
[9][10] Ishikawa was originally set to fight against Mami Odera as part of the 2009 Jewels -48 kg Rough Stone Grand Prix, but Odera was injured before the bout and Ishikawa was given direct entrance to the final and fought instead in a regular match at the event.
[11][12] In her second consecutive loss, Ishikawa lost against Miyoko Kusaka by split decision on March 19, 2010 (2010-03-19) at Jewels 7th Ring.
[13][14] Training with Reversal Gym Yokohama Ground Slam, Ishikawa rebounded with a victory over Misaki Ozawa via submission (armbar) in the first round during the 2010 Jewels -48 kg Rough Stone Grand Prix semi-finals at Jewels 10th Ring on October 10, 2010 (2010-10-10).
[27][28] Ishikawa competed in Okinawa for the first time when she faced Shino VanHoose at Pancrase Progress Tour 6 on May 20, 2012 (2012-05-20).