A sufficient amount of top lane Fioras perform better than that, such that you didn't cross the percentile threshold for an S.
ward more
that's kind of just fiora. you're expected to carry 1v5 with her kit.
Kill participation: 21/34 - try to get 90-100%
placed 9 wards - place more than 10 at least
damage dealt to champions: 2nd only to Caitlyn - probably try to beat her in damage
pretty good, but you were the only silver in the game, everyone else was unranked lvl 30,
Alright I think I understand now. Thank you for all of the constructive responses everyone.
you need higher than 7 cs per minute as well to get s+
Need moar cs