She is one of the strongest counter junglers in the game, with an amazing clear speed. Her ult isn't a team fight initiation like Gnars, it is an escape/chase tool that also gives her buffed stats and AoE. She is one of the stronger duelists, a great split pusher, can clear the jungle effortlessly, take early solo dragons with ease. Late game she becomes a monster of DPS and tankiness, with a decent burst combo as well.
Her hybrid damage means she works well on any team and cannot be defended against, plus she has %max HP damage as well. So no HP staking against her.
Her weak point is early ganks, but chilling smite into red buff works for that, or exhaust. She also could just focus on counter jungling instead of ganking. Without proper team efforts from the enemies, the enemy jungler cannot do anything to stop you.
You shouldn't be taking her top. If you are you are doing it wrong.