Wikipedia has a nice graphic for understanding the EM spectrum at https://en.wikipedia.org/wiki/.... Note that EHF which tops out at 300 GHz is still well away from the ionization breakpoint (usually defined for a water molecule which is in the higher UV band). Normal wireless communication is always under 100 GHz (follow the EHF link in the image) since for one reason, atmospheric absorption is a killer at the upper end of EHF. It's possible to use lasers for communication (more practical for space, but experiments on land have been done - not very practical for replacing wireless comm to omni-directional antennas though). For now, you can just think of all wireless comm happening at frequencies below light and thus non-ionizing which means an individual photon only has enough energy to cause heating. Throw enough photons at the same place and this can result in burning or death of course, but this is why levels are spec'd not to go above a certain flux density (usually to protect your eyes which are one of the most sensitive places to heating damage). Some military/civil/commercial transmitters will exceed this density which is why they are strict guidelines for workers interacting with these transmitters. Wi-fi transmitters aren't even remotely close to these limits.
Any other damage mechanisms besides heating are still speculative and to my knowledge, there is no scientific validation for any of them. So like you Tom, I am not afraid either - there is enough to worry about as it is (climate change and other ecological problems - some of it from technology, political problems, etc.). I sure hope this woman is shut down hard by the court system (which is another one of our problems I'm afraid - so nothing is certain).