Juhani
Initial Stats
Class: Jedi Guardian
Strength: 13
Dexterity: 16
Constitution: 14
Intelligence: 10
Wisdom: 12
Charisma: 13
Unfortunately, you and Juhani get off on the wrong foot.
Catwoman, as we refer to her, will evolve into your party's prime killing machine with a minimum of fuss. Her vitality growth will outpace that of your other two Jedi party members, allowing her to stand tall amid throngs of rancor without fear. Well, maybe just a little fear; Juhani's far from invincible, even with her huge vitality base, and you'll need to use her correctly so that she doesn't wind up getting overwhelmed in every fight.
Attributes: Raise strength first, just to get that extra damage per attack, then start getting her dexterity up.
Skills: Awareness and treat injury are both good choices. Don't kid yourself; even though Juhani has the ability to use stealth, she's definitely more a broadsword than a scalpel, and should be used appropriately. Without sneak attack, demolitions, repair, or computer use, the ability to turn invisible is somewhat irrelevant.
Feats: Obviously, lightsaber specialization is a good place to start. From there, you'll have to decide whether you want her to use two lightsabers (two-weapon fighting) or just one (toughness or dueling; preferably toughness).
Force Powers: Master speed is a must-have for Juhani: since she'll be in the thick of battle, she'll need both the extra attacks and the defense bonus. After that, good choices are cure, a maxed Force push, and either stasis field or destroy droid, with destroy droid being preferable due to its lower cost and lower level requirements.