She will sort herself out, I have one that sneakily eats the biscuits,(he has only 2 teeth so you can't hear him crunching!) but has high meat content gravy pouches, and 2 that eat only biscuits.
We have a water fountain, which they all use, what I do for my little pouchie eater is put a little water in the pouch in summer, so he gets a little more water.
We use a variety of biscuits, as we have made Poppy a fussy little moo, she likes to see 4 different lots of biscuits, and when you fill 3 bowls she meoowwwwwwwws for the 4th dish! sniff along and goes back to her favourite of the day.
Science plan, purina one are my cats favourites.
Try some of the smaller bags to see what she would like, but don't mix them too much as she is only a baby, and she might get a funny tummy,
Nicky