Few things about this match-up.
1.6A is your best friend and a well placed 623C. There's not many ways she can approach and attack you besides IAD J.B or J.C j.214x or J.236D. She spends most of her time up in the air charging, be patient and wait for them to do j.214x, if they do it towards you...6A her and follow up for 3k-4k damage.
2. Your pokes are WAY better than hers, If she dares to try to outpoke you then that's losing battle for her.Your 5B and 5C pretty much shuts her out.
3. Your DP is better than hers. This is self-explanatory.
4. Don't approach her in a predicable manner, her 2C is a damn good anti-air and it staggers. If you have to approach, just use chicken blocking. (Air Barrier)
other than that, this match is pretty free for Ragna (in CS1).