Build her on the tankier side, the way bestrivenna does, with out doing stuff like trading mr runes for cdr or rushing cdr boots. Black cleaver, spirit visage, deaths dance, ninja tabi/merc treads, deadmans plate, scimitar/maw/randuins. Take grasp of the undying and aim for efficient trades without getting hung up on trying to go all all in on people early game and snowballing. Just survive the lanes and try to be useful mid-late game in teamfights wit your cc and still very respectable damage despite your tankiness. People will waste a lot of coolowns trying to 1 shot you and it won't work, leaving your team open to take advantage while you back off and come back into the fight with some hp and cooldowns left to clean up.
Don't think about going to super glass cannon cdr rush riven style like boxbox unless you're a hard riven main with a looot of practice and matchup knowledge, and even then I'd say only go that way depending on the lane and team comp matchups. A heavier style riven has less ridiculous snowballing power when ahead, but doesn't get behind anywhere near as easily and is still relevant when behind unlike glass riven which can easily be shutdown and become 100% food for the enemy team.