maybe you could start mixing the raw meat with the fancy feast, and little by little, make it more of the raw meat and less of the fancy feast, until you get her to the 100% raw meat. just a thought.
i had a cat named "sam" - had him 13 years, and had to have him 'put down' due to a severe case of feline diabetes.
sure is tough to lose a pet - especially when you've had them a long time.