Well, I think since you've only ever fed her one thing - your options are really wide open. I feed NV Raw medallions and I love it. I researched a ton before deciding to go raw and made sure that I was making a very educated decision. I also consulted w/ Marcel's animal nutritionist (long story

) - and she was *all* for it.
So, you could do raw - if you're comfortable in what you've learned about it. If not, there are really, *really* wonderful premium canned foods out there too. The brands I like best are Evangers, Wellness, Wysong, Natures Variety (NV makes canned, yes, so you could get introduced to the brand this way).
You could also homecook (I used to do that as well) - there are many on here who go that route. I just find raw easier - and I have more confidence in the nutrition they're getting (in comparison to homecooking).
So, lots of options!