If you get CH'd by Asuka's ws1+2, you deserve to lose lol. There really is no mix-up, every Asuka and their mother will try to initiate some basic offence with cancelling f2 into crouch then either going for the ws1+2, the annoyng low slap or the launching 1+2 throw. Correct way to deal with this IMO is to low crush as soon as you see her cancelling the f2 into crouch, if you are too late, you get hit out of the air with the ws1+2 or some other ws mid which doesn't lead to any significant damage, the low and the throw gets blown up. There is no way to react to f2 anyway really so if you visually confirm the cancelled animation, just mash out an orbital/hop kick if you have one or something else. If she is too far away to connect any low crushing move you can just backdash away and she can't reach with the low or the throw.
Let's be real here, if you run across your average ranked Asukas they won't do anything that requires patience like f2 crouch cancel into sidewalk or just blocking to bait out linear moves or something that can be classified as an advanced baiting tactic. 9 times out of 10 they will take the proactive approach and mash something out because it's a habit they inevitably pick up from playing both ranked and that character too much.
Edit: A more advanced way to set up the ws1+2 would be to stick something out that's only slightly negative on block, has pushback and extensions, then just backdash once or twice into crouch and wait to visually confirm the opponent coming into range and try to catch them coming in with the ws1+2.
