Dont blame yourself to much ,hopefully she learned a lesson that she wont forget.Ive had the experience of meeting the worst car owner in the history of the automobile.A mechanic friend was the benafactor of all his malace deeds laid onto each car he got behind the wheel of,every 6 months it was another car with issues ,we would even play a guessing game to what kind of triggered event took place for the demize of each car that came in.