The only way she is viable in low elo that i have found is to play her as a full tank with no damage. I have played her enough with a Mastery 6 level to understand that Rek'Sai in low elo thinking you are going to start the game as a fighter/tank is a 50% chance success rate. Sometimes you will get lucky.
The mindset in low elo matches is that once you pick RekSai in champ selection, you have lost the opportunity to play her as a fighter because everyone else on your team ASSUMES you are going to play her as a TANK. SOMETIMES someone else will play a TANK and you get lucky, however most of the time you are stuck playing a role that she cant excel at because solo queue teammates' METAology has hindered your role as a reksai player. And then her getting raped by the nerf bat didnt help either. For all of Rek'Sai players who wish they could just hop on a squishy with
and
and then tunnel out. . .looks like those days are over.