Know how to use her R to gap close. A Flash R is often times a situation a R E would work. R has shorter CD then flash so make it a priority to not blow long CD when you don't need to. Seriously Not enough players use her R for aggressive moblility and save it for an excape or execute exclusively.
Kite early camps with Q, everbodys like OMG EVE INVADE SO EZ. Not when your high hp, not when you don't blow W befor checking for an invade or establishing vision.
DO NOT WAIT FOR CHARM EVERY GOD DAM TIME. seriously 65% slow is more then enough for low hp targers. your E and R will get the job done, if your not trying to 100 to 0, a good combo for low hp targets is to get close, break camo with a Q cast, Then cast W on that target befor Q lands. boom instant slow, almost no counter play with out great reflexes, and you got time to move up spamming Q and land the E.
Cut folks off, your W does not give away position until it is a charm. So cast and kite, with aggressive positioning to prevent them from excapeing.
Learn how to dance with her camo range, be aggressive, keep distance.
Abuse folks who make bad overextentions or don't buy red wards.