Liss I see is the relolacement for rumble on top lane, except with cc and mana. , maybe Ryze too.
Point is, nothing should be done about her. She was the first champ I baught because nobody was playing her I asked myself why and figured it out, because controlling her mana sucks.
Her are a few things the pros have managed where as I'm sure it's more difficult for the public scene to sea with:
1-small mana pool/regen; sure she has her passive, but the reasons for those two stars being so low is because of her passive. An 18 second passive that is reduced by one second by any of her cc's. She is spammable, but to a point.
2-small range; I think rumble has more range with his flam splitter than she does with her snare. Oh, you say she has Glacial path, well, this ability does do long damage in a straight line, yeah, but it's projextile speed is really low and what is its function? To engage or disengage, not deal damage. You'll be lucky enough to hit one target before you move to the other end of your claw before they reposition.
3-squishy to a fault; if you complain about her being a tanky initiator with no counter play, please rethink this. Look at her items, I'm sure it falls around RoA, Hourglass, And Abyssal, am I right? Those all are great for ap bruisers. But try the same champ say with a DFG and a DC, she is just like any other squishy Mage. She needs items to be that unstoppable Mage initiator.
I feel that to prevent her from scaling well with items is by shutting her down in laning phase. It's hard to come back as her with her low range.