Riot's Balance team cares more about profit than balancing the game
This theory is simple, Riot balances favors profit over gameplay. Think about it, if they buff a champion, people will start playing it and buy skins for it. There's a lot of situations where this happened.
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Almost got a buff after
got a huge nerf. Fearing Yasuo viability they tried to buff him so the profit will still be coming.
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They buffed him Twice before Championship Kha'zix came out.
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They buffed him before infernal ammunu came out to also boost profits.
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They buffed them shortly after their "High Noon" skin was released.
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They likely buffed her because her skins are a huge profit. With Pool Party released a few months before her (massive) buff