Subpoena of a random Muslim woman's records in the case

Why is Detective MacG subpoenaing the phone records of a random Muslim woman who accompanied Adnans father to the school to pick up Adnans school work?

How is this legal?. What probable cause is there to think that this woman's records had anything to do with the crime just because she was in the company of Adnans father on March 23?

http://lawprofessors.typepad.com/evidenceprof/2015/08/i.html

By the way, Vickie Wash, that Islamaphobic states attorney signed off on the phone records request.

Not to mention that detectives cannot be bothered to subpoena phone records of any of the other people involved such as Jay, Jenn, or Phil. People the self admitted accomplice after the fact to murder testified he was speaking with around the time of the murder. But they subpoena this woman's phone records.

ETA: Why the down votes? Are you arguing that it's appropriate that detectives subpoenaed this random women's records while not subpoenaing the records of Jay, Jen, or Phil, or Patrice?