Incidentally, every companion except Shadowheart is using the recommended ability scores for their class, so I doubt their statblocks were made to reflect their characters.
She was using recommended, people on forum wrote that it doesn't suit her Trickery Cleric with Urchin background build, also Larian data showed that she was dying at every occasion in fights so they rebuild her. And If I remember correctly now clerics recommended changes with their domain so Trickery gets Shadowheart's stats.
