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Relax she's still trying to adapt to her new environment. Unlike dogs, cats are very very very easy to keep as pets, she looks old enough to have picked up a few starter tips from her mum, so don't bother much.
Try giving her fish, or meat, preferably cooked coz she still young and it'll help her chew easily, although cats prefer raw flesh.
In summary, sardines and milk should do, only once a day, then beans with palm oil and crayfish, for a start they're attracted to that scent.

post pics of your cat size now