Senna Thought so far. ADC or Support ?

Hello guys excuse my english (¤)_(¤). Whats your thoughts on Senna do you think its more ADC or Support? My thought so far is that Shes gonna have bad early as an adc because when you will farm you cannot trade because you need to care about souls and also its good opertunity for supports to poke. She will be stongest in midgame because she cant actually build crit because crit dmg reduction to 146,5% max, Her build will be: Infinity edge, hurricane, lethality, bootsm, letality, lethality. Whats your opinion ?
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