It's odd, I've actually caught Rachels out of the wind during a clap loop before. I dunno what the specifics are, but imma need to research it more.
Either way, Rachel kinda has to camp Carl and only rush when she NEEDS to get to another spot, or really needs the damage. When I catch her between Nirvana and Carl, she normally eats 3-7k damage, depending on what I use to start it. Doesn't help that after one or two ground loops, she has enough damage on her to get killed by the next combo, and I have enough tension to RC and avoid bursts.
Still, Rachel's zoning is so anti-Carl that it's ridiculous. Nu is waaaaaaaaay easier to lock down. Even if you get a full fueco (the drill stab) on Rachel's block, if you mess up the slightest part of the trap, she's gone and you probably took a rod to the face if you pursued.
Rachel's madd gay to Carl. I might use Nu on her if I can't figure out the match-up soon.