A California mother is accused of not calling 911 as her 16-year-old son overdosed—and ultimately died—on fentanyl-laced Xanax. KRON reported that Danielle Foernsler, 34, and her friend, Robert D. Harrison, 39, were arrested after Harrison’s roommate called 911 Monday morning and reported that the teen was having a seizure. The roommate claimed he had just awoken …