Yes.
She wanted to divorce, but Pat threatened to kill her if she did, as he did with his ex wife and daughter.
Don't forget Niki asked for a gun as a Christmas present. That's her final option. Kill Pat.
She is willing to appear on camera, playing up the abused wife as a preemptive excuse.
"He was coming right for me! Veins and throat bulging. I must have pulled the trigger"
Remember Nikki ghoulishly filming Pat as he fought with police officers? That could've been her way out. Why couldn't Pat have been black, dammit!
Soon, she will take matters into her own hands.