Use tablet as handsfree for any Android Phone
If the car hs FM radio (most do), try one of the Bluetooth devices that plugs in the 12v outlet on the dash/centre console. I use one and they work very well. Mine has USB, SD card, 3.5mm Aux in and bluetooth handsfree and streaming. They're on EBay and Amazon for not much money.
Here are a few examples:
https://www.ebay.co.uk/itm/Bluetoot...reless-Handsfree/293005215588?epid=9034665675
https://www.ebay.co.uk/itm/Wireless...685169&hash=item5224ce9d3d:g:u-gAAOSwdJtdQQRs
There are a lot of them, just search for 'Bluetooth Hands free' or 'Bluetooth car kit'
Here are a few examples:
https://www.ebay.co.uk/itm/Bluetoot...reless-Handsfree/293005215588?epid=9034665675
https://www.ebay.co.uk/itm/Wireless...685169&hash=item5224ce9d3d:g:u-gAAOSwdJtdQQRs
There are a lot of them, just search for 'Bluetooth Hands free' or 'Bluetooth car kit'

Or, if she's actually a good person, back off--before she leaves you.