...hopefully you didn't marry her yet, and still have Henry free....
First of all, Galeforce and Limit Break are there to stay. Period.
Now, we need an offensive skill, and this cynthia only has Luna, so go with that. Nest, we need a defensive skill.You can either just go for Iote's Shield to give her more freedom, or plan a little more and fix her defenses with Pavise.
Lastly, a healing skill. She can get Renewal, and that will help her to be alive nicely.
in short: Limit Break Galeforce Renewal Luna Iote's Shield/Pavise
Confession Time! jRPGs are pretty much the best thing that ever happened to Video Games - Soanevalcke6