I don't want to reread the whole singularity fight right now but at the very least she was doing something cult-y with somebody at the beginning of chapter 70, so yes, she's definitely lying.
However, way back at the end of the first arc after Akira first whooped her ass in his hometown (chapter 10), Karamiez encountered Aria, who scared her shitless and told her that Akira is under her protection. I don't think she's dumb enough to try and harm Akira after that, so chances are this is less about him (though I'm sure she wants to better understand his power) and more about Medis.