a few things to notice from my playtime with her:
c.C works great as an anti-air, especially if you're trapped in a corner. in my experience, it'll win or trade against most air normals, though i'm guessing it's terrible for crossups.
i used to use j.D as an air-to-air, but it's really slow to come out. only works well if you anticipate a jump. use j.B instead since it has quicker startup, but be careful, since i think it doesn't have that many active frames.
for a jump-in, j.C is your choice, though the range is kinda poor so make sure it lands deep off a hop.
j.CD is indeed pretty good since you can EX decide into whatever afterwards. it's only really good for mid-range air-to-air. up close, you're likely to get knocked out of it before it even comes out.
EX mayhem has pretty good invincibility on it. though it loses to projectiles, i've never had it lose to normals and it broke through a lot of specials. plus, it has decent follow-ups.
decide has good range and, on a solid knockdown, is a good tool for keeping opponents defensive on wakeup. i'm not really sure if anything is linkable from a B decide, but you all know how well the EX version works.
i haven't tried anything with gorefest, so i couldn't tell you if it leads to any good follow-ups. should probably test it. the EX version has good range, but you're better off spending that meter on and EX mayhem/decide.
all that said, i still play a terrible vice since i didn't get to training mode her and i hardly did any research beforehand. only reason i'm adding these notes is because outside of her moveslist, there isn't much detail in this thread. i'd make more notes about her other normals, but i'm lazy and i probably should test more so i have a better handle on properties and whatnot. i hope she gets explored more, cause she's a pretty fun character to use if you're patient.