My advice is to not ban any of your counters, and play the matchup to learn exactly why they counter you. It's one of the best ways to learn a lot about your champion right away. And often you won't be able to ban your counters in ranked either way ^^.
As for actual counters to her, imo nearly every midlaner pre-6 is really bad for you, so keep that in mind. After 6 some matchups become way easier, mostly assassins are no longer that big of a threat for you, however be careful some mages such as Syndra can still kill you. Negatron helps immensely in these matchups.
If you're up against someone with lots of poke, look for ways to roam or ask your jungler to set up the gank, it can be hard getting to champions such as Ziggs/Xerath/Lux if they play safe.
Easy matchups are imo Zed/TF/Akali, basically they are assassins/casters without enough kill pressure against you (if you play correctly). Against some assassins don't be afraid to put extra points in W if you feel threatened.
Hope this helped!