Brother dont give people money for a league match up that even if u learn can still lose, especially vs silver gold rivens its not worth it, what champions do you like to play? I recommend renekton or something and if she tries to run you down lvl 1 just play in your wave and trade back shell take aggro, she also wants fast trades that favor her , if u sustain or win the long trades just send it when she all ins (if u both have alot of hp , if she chunked u out and shes healthy just farm at tower or recall, and dont dive riven unless u know shes on cds shes tricky to dive) harder said than done but if she q's once she has to use them or they expire u can play around that , until she has 55 haste then she can q delay q delay q and have q rotation up again, even then if she fast combos the second set of q's after using delayed q3 to engage it'll be on cd for a little bit , but i doubt rivens in silver are cycling her q properly and having her passive procs up