Leona is OP?

According to champion.gg, she has a 56% win rate now. I'm not saying she needs nerfs. It's nice to see someone other than Soraka doing well as support. But I'm wondering what made her so good all of a sudden. As far as I know, she hasn't received any buffs for a long time. http://champion.gg/statistics/#?sortBy=general.winPercent&order=descend
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