GF has a mid-range Samsung Android phone, her car has Bluetooth but not Android Auto. All the hans-free phone stuff works fine. Google Maps on the phone will give her audible directions over the phone speaker, but only while she's walking. If she's in the car, the phone quits talking to her, even though (or maybe because) the Bluetooth is paired and connected. Any clue what's going on and how to fix it?
Ideally, the turn-by-turn cues would come out over the car speakers, but at this point we'd settle for the phone itself talking to her.