Cat will gain an extra attack and fast movement. Sorry for not memorizing your rules again but it's been half a year since our last level-up. Will you grant Cat another feat / proficiency?
I have the following suggestions, open to discussion:
Carpenter's Tools (8 GP)
Ability: Strength
Weight 5 lb.
Utilize: Seal or pry open a door or container (DC 20)
Craft: Club, Greatclub, Quarterstaff, Barrel, Chest, Ladder, Pole, Portable Ram, Torch
Polearm Master
General Feat (Prerequisite: Level 4+, Strength or Dexterity 13+)
You gain the following benefits.
Ability Score lncrease. Increase your Dexterity or
Strength score by 1, to a maximum of 20. [Cat takes DEX as her STR is maxed out]
Pole Strike. Immediately after you take the Attack action and attack with a Quarterstaff, a Spear, or a weapon that has the Heavy and Reach properties, you can use a Bonus Action to make a melee attack with the opposite end of the weapon. The weapon deals Bludgeoning damage, and the weapon's damage die for this attack is a d4.
Reactive Strike. While you're holding a Quarterstaff, a Spear, or a weapon that has the Heavy and Reach properties, you can take a Reaction to make one melee attack against a creature that enters the reach you have with that weapon.