ABS sensors are in the hub/bearing assembly. Either bearings need replaced, or the sensors gone bad. Either way, get a new set of Timken hubs. And yeah, she should have noticed the f-ed up braking and the ABS module growling at her by now too.lol
EDIT: And it's fine to drive, just tell her not to be making any performance stops, especially while turning, as it may trigger the ABS.