A triforce early hasn't worked out for me. It takes too long to build if you're not getting fed. It's a nice item for her, but rushing it is expensive. I found a build that's been working for me nicely so far. Zerker/Merc treads depending on how much CC on the other team, Starks,starting with emblem and finishing with recurve bow, Guardian angel because for some reason it has made me an anti focus during team fights in every game so far (include sarcasm), bloodthirster for some AD and madreds/triforce depending on the other team's survivability items. Overall, abusing the true damage with attack speed and have some hp regen to synergize with her w will make you a much sturdier champion during team fights. I just finished a game where I had merc treads,starks,GA,bloodthirster and a recurve bow which allowed me to tank Sion,Cho, and Lux while WW flanked and we killed the 3 of them. Poor evelyn tried thought she could kill me until shen showed up and the three of us kill her. They broke my GA once that entire game. Silly me for tower diving 4 people... But yeah, I have a hard time last hitting due to mana issues until lvl 5 or so when my runes kick in. Her laning isn't bad either. Took some practice though.