Assuming Stella Is Really Good At Her Job...
Would any police organization really promote someone ready to hop in bed with anyone she thinks is attractive? I kept waiting for Dan Aykroyd to show up and give her the 'Stella you ignorant slut' speech.
Forget what it can do to team cohesion and chemistry, she could also screw up the integrity of investigations as she did with the first cop. Makes for good television but I doubt even Irish police units would allow it.