i played her a long time, on and off. long before the rework, and after it.
she really has not changed. she was always qeeee. she still is. Shes fine for what she is...basically an adc with ap rather than ad dmg.
apparently they decreased a bit the damage on q and w and increase damaged on e, also giving it some heal
her q and w never did so much damage, especially nto late game when ppl regen 100 health/sec or lifesteal etc.
so i guess before 90% of her damage was with e and after the 'rework' its more like 94% of her damage.
i dont see how shes changed at all really...shes jsut a bit stronger now.
besides q allowing her to refresh e faster on same target, it also gives her a speed boost (always did). and w slows the enemy (always did) making her pretty good at chasing people down for the last e to kill. Thats how this stuff worked before the 'remake' and its exactly the same after. with having a heal on her e, its also a bit safer for her to chase people a bit, since she never had really great range.
before the rework she was a strong laner. after the rework she apparently was an even stronger laner...too strong. her passive used to give her extra mana, now it giver her extra ap. She was too strong and they had to tone it down a bit. now shes about as strong a laner as she was before...but the same champs that she struggled with before are still kinda difficult for her...especially champs with good range that can poke at her outside of her range to retaliate much....things like brand/lux always gave her a hard time.
by the way...just a tip. It seems like most ppl open with her 'q' then do eeee and only use w if the q misses or something. I tihnk its more accurate to open with w, because its about the same range as the e , the hitbox is wider, and its persistent...so the slowed person will try to walk out of your w, while you get a couple es off, and then since their path is obvious and they are slowed you are sure to hit a q as they are nearly out, giving you the speed boost, and being able to chase the person down. So her 'combo' really should look like w e e q e e (dead)