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Don't buy attack speed items for her until you have 1-2 damage items. I usually run
Mercury's/Boots of mobility OR if you like Berzerker's Greaves (First attack speed item)
Last Whisper (First/Second attack speed item)
Black Cleaver / Infinity Edge
She farms creeps extremely fast to rack up Bloodthirster "charges". If needed you could add a brutaliser after your phage