I understand your point but I don't believe it works that way. The interfere with governmental function part would have to be related to the kidnapping itself at the time it happened. For example, someone kidnaps a senator in order to prevent them from casting a vote.
In this situation they're saying EA wanted to have sex with CM so he kidnapped her in order to do so, therefore making it aggravated.
There's another aggravating factor that says something about terrorizing, I can't remember how it's worded, but it makes more sense to me as a backup to make the charge fit.
I think EA's "interference" was just a way for them to get a warrant and not a charge they ever intended to prosecute because they knew if they could legally get a warrant that they would be able to charge him with something more serious.
Yesterday in Dallas, a woman was forced to get in her trunk by two perps pointing a gun at her and ordering her into her trunk. She was able to pop the trunk and flee. She survived thank heavens. I think that would be terror and an aggravating factor in charges against perps.