Willpower would be body, it would be used for damage resistance tests, but wouldnt improve you encumberance as encumberance isnt a test. Which I guess would tank you up to a degree. But logic to agi is better because you could use any armor you want (ignore the agi penalty) and stack yourself up to an insane level form fitting with pps 8/8 with riot armor and zoe executive line, 17/17. You're a pixie so go for all the edge and magic you can, It's tempting to get 6 points in mystic armor. puts you up to 23 damage resistance dice.8 sucesses usualy, then reroll with edge another 7 sucesses 15 damage resist when you need it. You shouldnt though because you'll be using infiltrate high logic, chamelion coating and concealment right?
Genetic heratige (optimisation logic) 8/12 natural/aug
5 points in logic
Way of the artisan.
0.75p in logic boost (up to

4 points in pistols (holdouts)
4 points in infiltrate
get chamelion coating#
Up your reactions
4 points in dodge
Improved reflexes 3 either by mystic adept with focus or way of artisan for 3 pp.
Up your edge
You cant get bioware so spend that 50 bp on making yourself an excelent hacker/ rigger. Alternitively up her charisma will and critical strike and astral combat to suport with that side of things. Its better for you to hack but if you have a dedicated hacker astral combat is usefull and if you have too many mages too then put up charisma and face skills. Highest natural logic, Highest natural social skills (ignoring intimidation), Highest natural stealth, highest natural will. You pick what to abuse.