State of Lissandra?

So recently, I picked up this character, and I've only played like 5 ranked games with her with decent sucess, 4/1. However I was wondering what she's considered in comparison to the rest of mid laners, I know that control mages will always be strong because of the cc and utility they can provide, however is it just me or do most other control/lockdown type mages do WAY more damage than Liss. On champ gg, she is the ranked 45/50 for damage dealt, and considering she's almost all aoe damage, this is super low... Does she possibly need a damage buff or am I not building her right? While I do have success with her the best thing I have is teamfights, in any lanes with enemies longer range than Liss (which is most lanes), I can almost never win lane unless they're squishy enough to all in so someone like lux or something, otherwise if I trade hit for hit I can't do much. Does Liss need a buff in her q or w? because I feel like she can constantly get pushed out of lane just because her trading is kind of hard.