I had to look around for any mention of it but i did finally find this.
Wearing a trench coat and backpack, she entered the converted sports arena between church services and opened fire in a hallway with an AR-platform rifle, Hassig said. One federal law enforcement source told CNN she fired around 30 bullets. (emphasis mine)
Two off-duty officers were at the church: a 28-year-old Houston Police Department officer and a 38-year-old agent with the Texas Alcoholic Beverage Commission, both with less than five years of service. The two officers engaged the shooter and she was fatally hit, the police chief said.