I think Kindred is way too strong as it is, her early is too strong for her late
Her base damages are really high and her scaling is too fast and too easy to reach.
Her E at rank 1 is a huge nuke on anybody if she gets her 3 hits(and she will, it has a massive slow tied onto it to get the 3 hits).
Her sustain is really really really strong in the jungle, she's one of the few junglers who can basically clear an entire jungle from one side to the other without burning a potion(maybe 1) and not getting low at all.
Her passive damage gets really high really fast. What I mean is that she gains too much damage for each stacks, she basically gets a free botrk once she is at 4 stacks which is tremendously easy to get.
Her ult is fine, I don't mind her Q that much(though it is annoying as fuck) I just really don't like how much sustain she gets out the ass and the huge E damage early in the game.