So, basically, i think TF is way too overrated for her. I know the proc from Sheen, which is then implemented in it, is very nice, the chance to slow your enemies too, about adding survivability...well, 250 hp is not gonna save you lategame, the AP on it is completely wasted gold, mana should be wasted gold too, you don't need so much of it, maybe until you reach lvl 6, but who can afford TF so soon...noone.
Instead of TF, i go for Phantom dancer, it gives you truckload of AS, which synergizes with Silver Bolts, more Movement speed than TF, which helps you chase/run away better, twice the crit you get from TF.
My usual build goes Doran's Blade, Zerker greaves, Vampiric Scepter for some survivability/lane sustaining, Phantom Dancer, Black Cleaver/Bloodrazor (which one goes first depends on conditions), same with Banshee's veil/Thornmail and as a last item, usually, if game is long, Infinity Edge.
Using ARP marks, AS seals, MR glyphs and MS/AS quints, depends how i feel.
What do you guys think?