If it has only just left mum it still needs kitten food, which is softer and easier to eat and digest. Someone said milk. NO do not give your kitten milk. It is bad for it as it is lactose intolerant to cows milk and will get an upset stomach. Give ( all the time) unlimited fresh water you do not say how old it is. This can make a difference to the advice you need.
Have you given her human food? My dog does same thing after I give her some Chicken. She won't eat her regular food. I simply starve her for a day. So that she'll anything.. It also lets them know your not going to get Chicken everynight. I know you might be thinking "thats Cruel" but it really isn't. It lets them know who's boss and that you don't get to eat what you want all the time. Hopefully this helps.
You can try giving your kitten wet kitten food that is flavoured like human food such as fish or turkey.Dry kibbles mixed with the wet canned food is also beneficial and a small saucer of warm milk with a small piece of bread should whet her appetite.
Its possible that your kitten just doesn't like the food you give her. Just as you have your likes and dislikes, favorite foods and foods you hate- so will a kitten
How old is it ?, if its a week or so , then give it some milk
If your kitten is young, it needs to get used to the new enviroment. It will eat cat food, when it gets used to it.
*Tip: Tabs like dog food*
*Tip: Tabs like dog food*
You answered your own question,your giving a kitten cat food.