Healthy to use same kitty food?

New kitty seems to like only food that comes in the tiny cans, particularly Fancy Feast Elegant Medley Shredded Chicken. Fussy! I will be donation about 20 cans of 9 lives and Friskies to the local shelter. It seems as though she won't eat anything but this gourmet food.

I don't mind(I guess) buying her this food but I do have a question. Is it healthy to give her just the same food, day after day? She will eat the turkey too. I have not tried some of the other FF varieties.
I must find somewhere that sells this stuff at less than 89 cents a can.

Yesterday I even tried to give her some people turkey. No go.
I never expected to have a shelter kitty behave like this. She is a love but is expensive to maintain.
Talks to me all the time and climbs on my lap every night as I read. Really a wonderful pet. Advice would be appreciated.
PR

But don't be surprised if suddenly someday she turns up her nose at it and demands something different. Cats are like that.