Even though the age difference between his new daughter and Bonnie and Jules means she won’t be a co-conspirator for some time. Having said that Shilo probably isn’t being too paranoid. After all, who knows what they’ll be doing as adults besides Bonnie is getting lots of tips from friends.
It’s probably best not to speculate why Nikki has so many dossiers and what’s inside them. Considering she was researching the cliques in her new high school we can make some educated guesses.