If you're a Luddite luser, sure it is. Now, if she could program the nanites, overwrite their AI like Calculator did with Kilg%re...or use an innate goodness to convince the AI to switch sides, like Jaime Reyes did with Khaji-Da...then it wouldn't be a problem, but Barbara is nothing like either of those characters apparently, so I guess by her rationale fear is the rational decision.