She is very squishy. get her overextended and bait out her e, then jungler ganks immediatly and you all in. Stay behind your minions so when she does her combo on you for a short poke trade, the full damage and the nearsight part of her q doesn’t hit you.
She relies very much on an early game snowball, if you out sustain her and scale well then you will win most of the time against her. (I said most of the time because there are those games where you team doesn’t respect Quinn’s roaming potential at lvl 6 and they feed her, or those ones where regardless of your play your team ints hard enough that you can’t carry them out)