Charlotte's Army by Patty Jansen

In a far future, a fleet of ships hurtles through space on its way to a distant war. Aboard the ships is an army of artificial human soldiers, highly trained and dangerous. Doctor Charlotte West, the neuro-technologist responsible for the soldiers’ artificial brains, travels in the support fleet. Two months before the arrival at the war site, the soldiers start fighting each other and disobeying commands. When they are brought in for tests, Charlotte finds that all seven thousand men share a pathological obsession with her.