So right now for you there should be two worries about food:
1. That you buy something that she doesn’t recognize as food or simply hates it, and refuses to eat it.
2. That she does want to eat what you give her, but it causes a bad reaction like an upset tummy.
Notice nowhere above did I mention nutrition, because right at this time it’s of secondary importance.
You actually are in a bit of a pickle right now because most breeders will simple give you a bag or cans with whatever they were feeding and then you can go to your local pet food store and buy it off the shelf. But it sounds like yours makes their own “raw” cat food formulation (and kind of a goofy one too as beef isn’t usually considered an ideal food for cats, especially as a staple).
I think your choices are:
1. Embrace the raw food diet and homemade manufacturing process and replicate what your breeder was doing.
2. Decide that you like the idea of a raw food diet but that the manufacturing process isn’t for you. If you choose this way, depending where you live, there may be some good off the shelf brands you can buy. Here in Oregon, my cats get Rad Cat, and Rawr. You can google those and see if they are sold where you live.
3. Decide that you want your cat to eat a more traditional diet of canned and dry food. If this is your choice, then the thing to do is to go to the Pet food store, explain that you are getting a kitten and want to audition some food, and then try to come away with samples to try. Don’t make the mistake of arbitrarily selecting one food and buying an enormous supply of it.
When you have that crisis averted you can then do some reading about cat food and nutrition. There’s lots of websites with that info. I’m partial to:
http://www.littlebigcat.com/category/nutrition/If you have specific questions let us know.