I'm not sure how I feel about her current setup.
+Longsword
+Dagger
++ Two Weapon Style
I get that they didn't want her going to grandmaster in long swords (which she would have in her old incarnation)
So...if you're avoiding Shadowkeeper, I'm thinking the best bet is go to a 6th level Fighter...and put one more + in both Dagger and Two Weapon style...grab the Dagger of Venom and the Golem Dagger +2 early....and get her to 9th level as a Thief for the x4 Back stab.
Her tHACO won't be as low as it was, but...she'll be able to wreck people with poison from the Dagger of Venom.