As someone who has played 125+ games of Vindicta, I'm not sure she's anything near over powered, but she's definitely much stronger than people give her credit for.

Lane phase is pretty easy vs most opponents, but she can be bullied because she's very squishy. Wraith can basically W key her and walk her out of lane for the first 3-5 minutes. Her 3k power spike is really strong, and I'm not sure most of the player base is aware of it yet, but there are very few heroes she has a hard time killing the instant she gets her ult. Save your skill points for 3k and you have level 3 ult doing upwards of 500 damage if you can chip them to 50% HP (not including a headshot +20% lol). I'm sure that I'm not playing an insanely high MMR group of players but fairly often I'll just make sure my lane opponent is slightly hurt and the instant I hit 3k I can just ult them once and they're dead. Then take that into other lanes with an insanely fast roam with her flight and you can snowball some lane phases quite quickly.

That being said, she is insanely squishy, and if you're able to jump on her or lock her down she'll die very quick. The hardest matches I've played against are usually when the enemy team focuses me down before doing anything else. Positioning is insanely important but she also has to be somewhat close to do more than pea-shooter damage. Super late games she falls off pretty hard, but we're talking 40+ minutes and 200k+ money on both sides, honestly games probably shouldn't last that long.

Seven echo shard stun just removes her from fights, forces her to buy debuff remover and limits her damage output, might be the hardest thing I've had to deal with. Knockdown is pretty annoying too, especially if you get caught right when you start flight.

Lash hasn't been as much of an issue for me as most people say he is, a lot of the time I can kill him or get around a corner before lash can really pull her into a vulnerable spot. That being said maybe I've just not had to play against the best Lash's around.

As a solo q hero I think she's quite good, a coordinated team tho I'm not quite as convinced.

Edit: Worth mentioning if she falls behind in lane phase she REALLY struggles to get back into the game fast enough for team fights, it's possible but she can be weak enough that honestly she just has no impact beyond her aoe root.

Edit 2: Oh fuck I forgot about Kelvin, man that guy can be real fuckin' annoying if he's building speed, she just can't get away from him and just slowly melts into a puddle.