Regular CS is almost always negative on block and in some instances even punishable. It isn’t a tool to use to get in with, it does have it’s uses though but it shouldn’t be something you rely on, AT ALL.
Using light CS during neutrla you can bait things such as AA specials(Ryu shoryuken, Guile Flashkick, it’s still hard to get proper spacing). You also use a regular divekick to alter jump trajectory, so it’s decent against AA normals, when jumping you use it for a short delay. An example is doing heavy CS against Chun her st.lk AA.
You can also use it in some offensive situations, use a few blocked normals and if you anticipate the opponent to press a button you can try a medium or hevay regular CS to get over it. This is not something you should rely on at all. Overall her regular CS is not that good.
You work your way in with Cammy by playing a solid neutral game with your normals, having the threat of EX CS to make opponent hesitant to play neutral with you which opens up jumps and dashes for you.
Cammy is a VERY straightforward which is all around solid and her execution barrier is low.
You don’t TK regular CS, only EX. Even then, there aren’t many situations you have to TK an EX CS either. Simply hold upforward and perform qcb+k(k) motion, nothing difficult about it.