This matchup is probably the one I have the most experience with...
Now, I'll agree that this match up is only slightly in her favor since she gains momentum faster and has an easier time corner-raping than you. You have a better life rating and deal mindfuckingly better damage than she does for less, on average. Occasionally, you can use her wind to your advantage (i.e. ending up where she didn't want you, like the other side of her), but I wouldn't recommend it unless you like living dangerously.
Common sense advice: Try not to IAD if there's a lightning rod between the two of you. Good Rachel players seem to have some kind of magical clairvoyance as to when they should move to shut that shit down with a Sword Iris. It's not really such a bad idea to see if you can get her to come to the other side of it, and she might do that since a negative penalty generally means more to her. If she's on the other side of a lightning rod and summons a pumpkin, rush her down fast since you can smack her with something strong in the recovery time and that pumpkin will be gone. If there's a frog near you, 5C/3C (duh) and get that shit gone.
If you have the magatama, and she's coming at you, that means it's time for 6C > Shippu, or Zantetsu > Any rape you want to follow it up with. Rachel's stuff is incredibly safe, so probably the only shit you're going to be able to punish is a summon, and good luck on that one. Oh, if you're in close, her lightning rod eggs will pretty much consistently out-prioritize anything that uses magatama, so be careful.
This match tends to become a battle to be the one that's not in the corner, getting fucked in the mouth. Your 6A and 6B are some pretty good tools to have if you lose that battle initially. An average (hell, sometimes even a good Rachel) is generally a character of relative predictability, so, if you're good with them, it shouldn't be too much of a hassle to catch the Draculoli bitch with a Drive and put the fuck on her with a half decent follow up.