Amber Obaze and Takeisha Lewis each added 12 points for the Lady Techsters (6-1).
Jill Chapman led Indiana (7-1) with 21 points and Tara Jones had 20. Heather Cassady missed a short shot as time expired.
Brooke Lassiter made one of two free throws with 1:32 left to give Tech a 54-51 lead. Erika Christenson hit two free throws for Indiana with 42 seconds to play.
Indiana went inside to the 6-foot-5 Chapman early in the second half and she scored eight points to give the Lady Hoosiers a 35-34 lead.
Tech went back ahead 40-37 with the help of Walker's six points. But Jones scored six of Indiana's next eight as the Lady Hoosiers regained a 42-40 lead with 11:47 to play.