uh i can help you a bit with this bro…
First of all, this is pretty much obvious but: If u corner chun-li, its game over for her, you MUST aim for this during this fight or it will be a lot harder.
the way chun keeps u out is very similar to how guile does, luckly for us, chun doesnt have the flashkick so once you get next to her is pretty much GG. so, round starts, she might now throw a fireball cuz rufus can easily jump over and punish, so she’s gonna either 1-. backdash: take advantage of this and dash once, you are now closer and she’s closer to the corner. 2-. stick out a normal…most likely standing HK: just block…yeah. You have 2 basic goals here: 1-. Knock her down, kinda hard without meter, but doable and 2-. make her block a tornado, now you are right next to her and she needs to go back or she risks being pressures to death, now, be careful here, tornado is -1 on block, she cant punish it, but if she does cr.lk or std.lp it will beat any normal you stick out, so here just watch what she does and react.
most chuns throw kikoken and react to what you do, some others follow it by walking, if she is too close to the kikoken, block and block, or try to get EX messiah between her strings. This fight is a lot more about blocking a lot, eating chip from kikokens, and wait, you DONT need meter to beat her imo, you need just 1 knockdown and u can start going crazy. also, chun has an option select vs rufus: DF + LP LK during pressure, if rufus throws, she techs, if rufus divekicks she df + lks you. this option select is quite dirty, but it loses to a simple close HP XX HP tornado, so first watch if she’s using the OS and punish that shit accordingly.
oh and EX messiah between far mp xx kikoken