Haven't fought much Noel, but I think we all agree her drive is as aggravating as Nu. Best way you of everything is specials, even DS since its slow start up, and rare usage, will surprise any player. Granted it doesn't last long and shouldn't be used except when your at the far side and she HAS to come to you. If you do that a couple of times she should become wary, then when she tries to fake the rush you can,
A) Hells Fang half screen for small damage, and cancel if you have heat for combo, fun way to screw up their day.
B) TK, or regular GH, seriously if they don't see this coming they have never fought a Ragna. Cool thing about it is that you can let the second hit go and RC for j.A spam on the way down. Unless she does a drive that has an immediate hit box she's knocked out with a CH and you can eat her.