We used to feed dry dog food kibble to a whole bunch of raccoons living in a ravine in Toronto when I was a kid. They were fairly friendly but of course we had food for them on a regular basis so that's probably why.
I suppose if this raccoon is angry already it might be a problem but I would think if you could get behind the trap and open it he/she would be mainly focused on exiting the trap and getting the he** out of there.
Raccoons and cats have been known to get into nasty scraps. I wonder if Nikki has come across this raccoon. It might be the reason she is not coming out of hiding. She could be spooked or injured. Do you have a garage that you could leave slightly open that Nikki could sneak into when she feels up to it? Or maybe a basement window during the day? I know that you might end up with the raccoon again but it might be worth trying if it meant that Nikki might come back inside.