Is Diana jungler OP?

I just played Diana jungler for the first time today and she felt amazing! Super easy to play, fun, great sustain, high damage, good engage, great balance of offense and defense thanks to her shield W move, and an ULT that has super low or zero CD sometimes. And all her moves cost little mana or free sometimes. I am new to her, so I am curious what the community thinks of her. Share your thoughts and thank you.
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