You can often tag on an extra Sepultura (qcbK) when people are on the ground at the end of combos. Like (close)S downH Sepultura K Sepultura Sepultura.
Use her spiralarrow move (qcfK) to close in through projectiles (it destroys one projectile it hits), it is plus on block. It's harder to use it in combos, but it can bounce-juggle people from the wall in some.
Her jump special (qcbS) is reactable, so not the best for mixing (but it as well is plus on block). Doing a crossup airdash jK qcbS (in the original direction, not switching commands even though you crossed up) seems its main use (because that gets you a combo if you RC).
Bind a button to the dash, you're going to use it a ton. She has an amazing dash, and you can extend the reach of anything by doing, say, Dash downS - she sill slide forwards from the momentum while kicking. An advanced application of this is advancing with Faultless Defense up (by doing dash backdown+two buttons) to do protected hops forwards, but don't worry about that now, just know that it exists.
Her jumpDust gets you amazing carry in air combos (jumpD airdash jD is a common thing). Her downDust sweep has deceptive range.
Thanks for all the tips! I've been trying so hard to get used to the dash button being a thing (mapped that immediately upon first getting in the game, along with RC and burst) and man is it fun as hell to stagger as her. 2K, K, 2S, S, 2P, P, Dust, grab, multiple P, multiple 2P, back dashing randomly after normals, random instant air dashes, some normals into Sepultura, some normals into Travao (Spril Arrow), some normals into Sol Poente (jumping kick thing) -- she has so many options to fuck around with due to her insane speed. Toss in the occasional RC and it's just ridiculous so far. Granted, very VERY few people I've fought so far know to YRC or faultless defense things yet so we'll see how well all this staggering works when I fight people who use their defensive options.
Have yet to fuck much with air combos as the timing on them has been a rough thing to learn so far, but I have at least learned to do a basic RC cancel off grabs via jK jD. Got two basic bnbs I've been relying on so far, but I really appreciate knowing that you can OTG with Sepultura after Sepultura. I knew you could do it after Sol Poente, but that's pretty big to add that extra bit of damage onto the end. I've also found that basically any corner situation where I can OTG, I do it immediately to force them up faster for easier staggers. It's been catching people so off guard.
Been going decently well so far considering it's my first Guilty Gear game. Gotten absolutely THRASHED by a couple players who actually knew what was going on though. Definitely in that crutch stage where I have decent universal fighting game fundamentals but no real skill with the game itself. Towers just locked me into floor 9 or higher so I'm sure I'm about to get kicked right on back down to floor 8 soon.
EDIT: also, this lobby system is one of the worst experiences I've ever had in any videogame. It is literally designed to KEEP you from playing the game. Absolutely unacceptable and beyond fucking stupid.