I heard an interview with the SI reporter that did the "Full Manti" cover story. He said that he did do a fact check and couldn't find a record of the wreck, of her attending Stanford, of her death, etc but went ahead with the story blaming deadlines.
He said he actually called the SID guy, or someone, at Stanford to get some info on her for the story and the guy said that he couldn't find her student info in the system and that he was surprised that a Stanford student was dating a high profile Notre Dame player without him having heard about it and how that usually doesn't happen since their campus isn't overly huge.
Just seems like a lot of flags to completely ignore.