[@Pezz570]

Yeah, the difficult part will be to really found a way for Karina to communicate with the military. 
Without a trained bird and being completely walled and guarded by the cultists will make that really difficult.

Maybe a recon group or something could maybe be nearby the border or something?

There is another way. It's risky and taxing on Karina's body and it would IMMEDIATELY tell pretty much every freaking cultist on the entire nation where she is, but it's something I could see her doing in a tough situation.

Using her ice magic to create a beacon or something. Something tall that others could see from the outside or maybe to reflect light to work as a spotlight or something.