If you want to see a few examples of moderately specialized characters, here is a link you might want to follow:
Also, if you want to keep the stats evenly balanced as they are, I would recommend giving her at least one magic skill so that the 1 point in MAG and the 40 MP don't go to waste. With that low Magic Attack, you'll probably want that skill to be something non-offensive like Benediction or Healing Magic so that you don't have to contend with anybody's Magic Block.
If you do want to specialize her, though, I personally would recommend shaving one point each from WIS, DEX, STA, and MAG, then distributing these points between COU, INT, AGI, and STR as you see fit. This will bring her AT/PA up to 15/15, which is pretty decent, and will open up a few options:
If you want to keep her TP from decreasing, add one of these points to COU. If you want to keep her number of skill points from decreasing, add one of these points to INT.
Adding points to COU will increase her TP by 3 per each point added, her Initiative by 1/2 point per each point added, and her Magic Block by 2 per each point added. Adding points to INT will increase her Magic Block and Missile Evasion by 1 per each point added and her number of skill points by 2 per each point added. Adding points to AGI will increase her Initiative by 1 per each point added and her Missile Evasion by 2 per each point added. Adding points to STR will increase the amount of damage done by her physical attacks and allow her to use heavier equipment. And finally, increasing any stat will improve the effectiveness of any skill that uses it as a base stat.
Given that she is both a merchant and a trained sword user, I would recommend putting most or all of the 4 points into INT. The reason for this is that INT would be a useful skill for merchants and sword users alike and seems to appear fairly often as a base stat in Edith's list of skills, so it would make sense that she would have developed it. Alternatively, there would also be merit to distributing the 4 points evenly between the 4 stats, as that would allow her to still remain pretty balanced.
On the other hand, if you want her to be able to learn magic at any point in the future, you'll need to leave that point on MAG. In that case, you could take a point out of CHA without being criticized (you could normally take CHA down as far as -2 and get away with it, though that would damage her competence as a merchant and leave her at a social disadvantage even if she succeeds in communicating), or you could just take 3 points to redistribute instead of 4.
Of course, all of this is your call.