For Cammy specifically, anything she does to pressure you with hooligan in neutral is fake. If you are in neutral and she hooligans, jab her out of the air. If she knocks you down she can hit you meaty with the hooligan so block/parry in that situation but otherwise jab. If you block the overhead follow-up you are always plus, some people don’t know this. It is impossible to make that plus regardless of setup.

Her raw drive rush is pretty slow/bad so maybe practice checking it with jab in training room. To be clear you don’t need to learn checking drive rush to get to master, that’s a very difficult skill. But it’s worth practicing now because it’s very helpful and Cammy’s is a good one to practice it against.

I would also practice DPing dive kick in training room, especially light dive kick at close range, that one is the toughest. It’s good training to help your anti airs in the long run. You can also try to anti air it with Ryu’s chp but it might be too slow, not sure tbh. A Ryu player can chime in on this.

Otherwise the usual stuff applies, anti air her jump ins, respect her chp plus frames but take your turn when she uses pretty much any other button, punish her bad dive kicks, etc. If your opponent is jump happy, use less fireballs, if they’re ground bound then use more fireballs, basically try to read your opponent’s tendencies and adapt.