If I had to build her I would do this:
Race Custom lineage with +2 to dex, the feat sentinel, and the skill of arcana
Background Noble
Stats
Str 8 Dex 16 Con 12 Int 12 Wis 14 Cha 13 (after race and feat bonuses, 27 point)
Class
Class break down of Monk 5 (Way of the Kensei)/ Warlock 1 (Hexblade)
Chose the skills of Athletics, Acrobatics and Alchemist Supplies
At level three you take Calligrapher’s Supplies, Longsword and Shortbow for Path of the Kensei feature.
At level four you take the feat Martial Adept with Parry and Grappling Strike
With the Warlock (hexblade) level you take the spells booming blade and lighting lure (acts as her whip effects) with the 1st level spells of armor of Agathys and Wrathful Smite.
This combination grants her strong defenses, her ability to control and dominate opponents with close range options and high damage potential using kensei and hexblade’s curse as further damage options.
https://ddb.ac/characters/64009351/Wu8Ie0
