Everything was in slow motion for Nicki that was headed straight towards the Alpha's chamber, she wasn't supposed to do this now when the Luna who was supposed to help her out first to do it hasn't done it yet, however in fear of her guides sabotaging her plan. She couldn't just sit still and fold her arms doing nothing.
Nicki knew right now it was up to her alone to make sure her plan ends up a successful plan, there were no excuses to make if it doesn't. The only mistake she made in the first place was to depend on someone when the Luna might actually turn out to be the kind, who could be among the people her guides can easily influence as Ariana pointed out and she eventually happens to listen to them.