If I'm reading this correctly, she was using her phone as she approached the garage with her friend, and her last call was to her boyfriend. So, she was still holding her phone, which presumably was still switched on, when she approached her car. Her car wasn't entered, and there are no signs of a struggle ....... so what happened with the phone?
Unless the police are keeping some things back - the phone wasn't left behind, the phone wasn't used to call for help and the phone hasn't pinged anywhere.
So, if she was abducted with her phone in her hand, then could it be that more than one person was involved? Because for one person to grab the phone and disable it there and then, surely another person would be required to keep her trapped where she was? Unless someone aimed a gun at her and got her to hand it over.