It may be that she has a touch of pancreatitis even if she doesn't have vomiting and diarrhea. Pancreatitis is an inflammation of the pancreas. The pancreas is a gland that produces and releases enzymes into the digestive track that aid in the digestion of food. When these same enzymes are activated while they are still in the pancreas, inflammation occurs and the enzyme start "digesting" the pancreas itself. Some common causes of pancreatitis are eating a lot of very fatty foods, obesity, steroid use and other diseases and conditions. Grease can lead to pancreatitis.
Symptoms of pancreatitis vary but include vomiting, diarrhea, anorexia, weakness or collapse, dehydration, shock, fever, depression, and upper abdominal pain. A dog may indicate abdominal pain by acting restless, panting, crying or wincing when picked up, shaking, standing with an arched back, or lying with the front end down and the rear end elevated
You can read about it in detail here:
If just staring, you can try withholding food for 6-12 hours. After that try some pepcid. Read about Pepcid dosages and usage information here:
Give the pepcid about 45 minutes to work before offering a small portion of boiled chicken and rice. I would stick to this bland diet for a few days since she did not only have grease but the onions and garlic were fried in it.
Let me give you information on onion poisoning and garlic is similar. Onions can cause your dog to be ill due to thiosulphate poisoning. Dogs who have ingested onion can develop anemia due to red blood cells bursting. The first signs of onion poisoning are gastroenteritis with vomiting and diarrhea. There will be a loss of appetite and lethargy and trouble breathing. The breathing is caused by the fact that the red blood cells carrying oxygen through the body are reduced. Frequently their urine will be reddish.
The acute diarrhea and vomiting can lead to dehydration. You can check this by lifting the skin between your dog’s shoulder blades and if it stays tented or is slow to return to normal position, your dog is dehydrated and needs to be seen by your Vet so fluids can be given.
The poisoning occurs a couple of days after the onion has been digested. It does not matter if the onion was raw, cooked or mixed with other food. A single meal of 1 pound of onions can be dangerous to a 15 pound dog. The same poisoning can occur if smaller amounts were fed over several days. The condition does improve once the dog is prevented from eating more onions. If your dog’s gums are pale white and he develops symptoms of onion poisoning listed above or becomes dehydrated, contact your Vet.
When she wakes, you might also want to check her anal glands. A dog walking with the tail between the legs often has anal gland problems. If your dog is dragging their behind on the ground or carpet and their anus area has a bad odor and swollen, it can be symptoms of an anal gland problem. You will want to check to see if your dog's anus is swollen. This may cause a dog to continue to lick the area.
The anal glands are 2 sacs on either side of the anus at about the 4' o'clock and 8 o'clock positions. If your dog is continually licking their anus and dragging it, it could also indicate that they are full. This problem can usually be resolved by emptying out the glands. To empty them or express them, you will want to cover the area with a tissue and press your finger on the dog's anal glands with an upward motion. A foul smelling liquid should come out. If nothing comes out and your dog appears to be in pain, you should take him to the Vet. Your vet can do this easily, as he is experienced at it.
Excellent site on anal glands
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Since there have been recalls on certain foods, please check the following site to be sure the food your animals eat is not affected. If it is affected, contact your vet as soon as possible. Have your dog seen if they have any symptoms.