Advice standar for Ranger:
IMO, Sehsat has unique skill and has big advantage with her minion, and this minion health is depend on % of her HP. So I think good path is HP/Att/Def or HP/Def/Att.
But because she is sniper, choose Att path 1st is also not bad. Both path is great.
For +8 and I would choose mana, HP.