Well, unless she has an immunity to cold then she'd just die when she was frozen. I guess the other ice powers can go, though, that was just something that to help her fight.
Electrical impulses in the human body and thermodynamics aren't technology and existed far before the Incan Empire, so they wouldn't be affected. As for technological enemies, unless someone relies on the technology to live then the technology would just be deactivated for a little while. She should probably be kept away from people with pacemakers.