Most commercial raw mixes designed for felines are nutritionally balanced, but it's always best to ask the store clerk where you purchased them just to make sure. Personally, I don't like buying stuff with stuff other than what's naturally found in raw meat like parsley, molasses, ground flax, etc. Cats are obligate carnivores, so how can you really know if they can even metabolize these "non-meats" to obtain these vitamins and minerals which are mainly plant based sources?
If ever in doubt, I'd rather purchase B-complex vitamins or minerals from a supplement store and add it to their food. Better yet, just switch over to frankenprey and skip the whole vitamin supplementation thing altogether, ground raw does nothing for feline's dental health anyway.
One ingredient for a young cat I'd ensure they have in abundance will be taurine. It is most abundant in hard working muscles like hearts and legs, so those are things I'd look to buy most.
For cats to enjoy their mealtimes more, I'd also look to add more variety of proteins to her diet. Various meats will prevent her from becoming bored with food, and may prevent protein sensitivities as she gets older. Currently, my cats are fed chicken, turkey, beef, pork, venison, rabbit & duck.