Im worried about change in food for my cat. Help please.

Kittens are lovely... Also Karush my kitty friend.

When i bring her home, I fed her whiskas dry food I bought from a pet store. It is 1 kg. she ate the entire 1kg in 2 weeks. I REALLY DONT KNOW is she over eat or not. By the way, she is 3months old when I adopted her. She's a siamese cat.

I then buy another brand of catfood, thinking that she might get tired of eating the same food. So i buy Princess Cat Premium Dry Food. She ate the whole first serving I gave her.

I then decide to gave her a wet food, so i bisit the shop and get a pouch of Whiskas Jr Tuna flavored. I gave it to her as a treat. Afterwards, the problem arise. She snob the Princess dry food i bought for her. I really dont know the reason. I dont know if she wants the whiskas dry food or the whiskas jr tuna flavored.

To feed her, i decided to mix a wet food and a dry food. Any aadvice you can make? My questions seems to be very basic, but i really want to learn. She is my very first pet.

Thanks..

Welcome to The Cat Site and you are caring cat owner wanting to feed your kitten the best food.
Yes kittens are quite lovely!
Generally, you can feed a kitten as much as they can eat. They grow up very big very fast !
Wet food is better for cats than dry food. Dry food generally has more carbohydrates and additivies than wet food. Grain, oatmeal, tapicoa, starch, peas, corn rice, potatoes--they are all carbohydrates of various forms. Cats don't need carbohydrates, they can't really digest them very well. They do better on a lot of protein and some fat (they need more fat than humans do). Some cats are sensitive to additives and certain grains.
Can you find a canned food that says on its label "grain free"? That is a good indication of a decent or good food. Also, I would keep on trying different flavors of wet food. This is so your cat doesn't get "addicted" to one type, flavor of food. Variety is a good thing! I think you don't live in the United States--we in the USA (still) do ounces not kilograms. I understand you may not have access to excellent quality canned foods (like Evo, Wellness, even Fancy Feast Classic or Friskies Pate). But what other brands can you buy besides Whiskas?
Here is an article about choosing the right food for your cat. And here is an article what you should know about feeding your cat.
Let us know how your cat is doing.

Thanks.

Fancy feast classic is available here in our country. It cost $0.8 per can.. Should i feed her 1 can daily?

According to the kitten pros here, feed her as much as she'll eat.  

That might mean 2-3 cans a day of your Fancy Feast Classic etc. 

Just watch her and if the bowl is empty, open another can and try 1/2, if that disappears, give the rest.  Eventually she'll get full and stop eating.  There's no worries about her getting obese, as a kitten. 

Have fun and don't eat the canned food; some of it almost smells good enough to spread on a cracker

Edit - if you go strictly wet and choose Fancy Feast classics - those are 3 oz cans averaging ~  88 - 100 calories each.  An adult would eat 2 of those per day easily. Some more, some less. Your kitten should be allowed to eat at least that much + whatever she wants after that. 

Which will you prefer, fancy feast or royal canin?
Im also planning to pffer the cat raw food, but im afraid she might not get the nutrients and vitamins she needs.

Fancy Feast is cheaper here but how much is Royal Canin for you? 

My 1/2 Siamese will let me know when the little bowl is empty and she thinks it needs more.  Today she started knocking cat food cans off the shelf.  We are lucky she can't open cans.

Royal canin cost $0.9 per can here in our country.

I personally would go with Fancy Feast Classic, it has less grain.

But I'm no expert in canned food :  I feed raw (prey model raw).

If you have access to a variety of meats (at least three) and organs such as kidney, liver, and either bone or egg shell, then feeding raw is a good alternative (some would say the BEST alternative).

There is a lot of information in the Raw and Cooked Food forum.   This is an article that briefly discusses raw feeding.  http://catcentric.org/2013/05/23/a-raw-feeding-terminology-discussion/