IMO the prison sentence shouldn’t have been suspended, hit and run she fled the scene and waited 4 hours before reporting car damage. Conjecture but given that she has previous for drink driving you’d get good odds that she wanted to sober up, probably the morning after a big night.
She offers up the paper thin alibi that she saw the damage to the wind screen and assumed it was her ex? So she was driving along and her psycho ex has either been laying in wait for her or is so enraged by the sight of her that he leaps out and batters her car/throws something at it. Our girl then waits 4 hours before contacting the gardai giving said ex ample time to finish the job rather than taking advantage of this heaven sent opportunity to see him behind bars?