Your wife is probably a good rider, but this can happen to any of us. I have a 40-year-old lady friend who is buying her first motorcycle, and has just completed the safety course in Oklahoma. This post reminds me that I need to preach to her about 4-wheel drivers often just not seeing a motorcycle in their path, as the modern driver's brain seems to be trained for caution mainly about hazards as big as, or bigger than, their own conveyance. I've dodged so many cars recently on the FJR, that I've started using my bright-lights in the daytime, hoping that I will be better seen. Don't know if this helps, but worth a try.
Best wishes for your wife's recovery.