Can you give more details about the circumstances? What time of day was it, how long after eating, how she seems in herself (is she acting normally or does she seem subdued?), any sign of stomach upset (loose stools etc), was there any hair in the liquid (its shedding, and therefore hairball, season, after all ) etc etc. The more information we have, the easier it is to help
I have to get early and buy food for them, I have dry food only for nowI don't understand. What do you mean by there is no food?
Only your vet can say whether a blood test is needed or not. Sometimes vomiting bile is because of hyperacidity in the stomach, often caused by not eating for some time (some, usually more sensitive, cats get this first thing in the morning if they don't have food available overnight). However, if she's got a bug or other tummy upset of some sort, withholding food is definitely the right thing to do in the (very) short term. I'd never want to go more than 24hrs though, unless a vet specifically said otherwise.
Do you have any plain chicken? Absolutely plain cooked chicken is very easy on the tummy, and a little of that might help settle her a little, especially as she's asking for food. Plain scrambled eggs (no dairy or seasonings added) are very gentle too, as is plain cooked white fish. These are all foods that my vet suggests when a 'light diet' is required, such as following an operation. Provided that her poop is relatively normal and she's well in herself, I can't see any harm in offering her a small amount of one of these foods.
Do call the vet in the morning, at least for a phone consultation. Try not to worry. Young cats are pretty resilient, and I very much doubt that you're going to lose her. She likely just has a stomach upset or a bug, or maybe parasites or a food allergy. All of these things are very treatable or manageable. I'm sure she'll be just fine once you find and treat the root cause. Hang in there
I guess the gave her this morning a wet food"whiskas" I hid it, because she hates this type of foodMy kitten always used to sick and I was always beside myself! She can't eat any cat food with jelly or gravy and has royal canin gastro intensal . Boiled chicken will do it and when she goes to the they should give her an anti sickness injection and take her temperature . What did she last eat ?
Basically, I'd avoid anything that has the word 'sauce' or 'gravy' (loaf in sauce or pouches in gravy/sauce). The sauces/gravies contain grains to thicken them, and it's generally better to avoid these if you can. Plain pates or chunks in jelly tend to have fewer (if any) grains or starches, making them a better choice. Having said that, ultimately the best food for your cat is the one that she will happily eat. It doesn't matter how great the food is if it stays in the food bowl
In general, I find the Royal Canin foods to be pretty overpriced for what they are. Which country are you in? Someone may know of other good options for you to consider