Tell her dad that with a manual her right hand will be too busy shifting so she cant rub on her boyfriends leg.

Also, when things get old and broken down the road I'd rather pay for a new clutch and flywheel rather than an auto tranny repair.

Oh yeah, her hand will be too busy shifting to be holding a phone with her right hand.

Her hand will be too busy shifting so she cant hold the mirror and check how she looks.

Her hand will be too busy shifting so she cant play with the radio controls.

Also, ask her dad if he's convinced yet after reading my post.