I see nothing at all wrong with her power currently. I played against her and I played as her, her clear now is perfectly fine and healthy. (Props to Riot for finally making her clear manageable)
I personally am happy that Lee Sin will finally think twice before counter ganking my world now, since I can actually do something against this guy who is played 1,000 times in a row.
When I thought of Sejuani long ago, I seen a person who was camped by 3-4 people in the jungle warded non stop because EVERYONE knew how easy she was to trash early game, preventing her from even reaching late game.
If they nerf her, they should feel horrible since she's actually more playable to counterganks now.
But yeah, let's complain about Sejuani guys. -clap clap- We'll see how much people cry when she's nerfed and unchanged when she's actually not that bad currently.