My personal experience with Skarlet is that offline, you have to sacrifice two major fundamental things that come naturally, such as:
You cannot capitalise on your counter pokes against allot of the cast as much as other characters can, because of her lack of decent fast mids, D3 doesn't really meaning anything on hit, especially on a standing block, her mids are slow, and her 112/4 string will be instantly poked out of everytime, even on standing block. And I know skarlet mains will say ''But F4 slide''...but it's far too difficult to hit confirm at high level, and when you get your D3, you can lose damage by auto inputting F4 RD Slide.
So you can't play a conventional rushdown and (most importantly) defence game with her, you have to play it the same way as Sonya, ARMOUR minus the 7 frame jab...there is a reason they only use D4 and Armour, so this gives her issues in allot against allot of characters.
So you have to resort to allot of instant air close downward daggers as a valid counter poke to start pressure and reverse the opponents offence.
Also, you need
REO like composure and execution, as even Ninj will tell you, you will drop combos in high steak offline matches when it matters, so to be safe you need to have basic low damage B&B's to guarantee the combo, so there is another sacrifice you make with her offline.
You could pick up Kitana or Sonya instead.
