find her weaknesses
Her weakness is supposed to be a very weak early game, but this isn't remotely true at all anymore. Multiple reasons: Lane Bullies got nerfed, Q and E are very safe for dodging and disengaging (and both have potential for kills as well combined with her passive), BoRK rush is extremely good on her (Gives everything she could need. Other ADCs have to rush IE for a similar power boost and they don't get a Vampiric Sceptre/Sustain in the build path.) and has a bit more kill potential early game than other carries. Also thanks to tank meta, is the only one reliable able to deal with the meta (not much other tank busters exist. Kog'maw comes close, but suffers from being reliant on a protect-kog'maw composition, while Vayne can fit into almost any composition.)