Hello, I am very sorry to hear about your girl.
If she is not used to table food, especially fatty fried food this could very well be a reaction to that. The concern is foods high in fats can trigger a bout of pancreatitis. This is inflammation of the pancreas which leads to increased enzyme production, abdominal pain, vomiting and if severe enough, peritonitis.
At this point we can try some things at home but she may need to see a veterinarian if she isn't coming along well.
To try and settle her stomach today you can try either:
1) Pepcid-ac (famotidine) at one 10mg tablet per 20 to 40 pounds of body weight
every 12 hours.
2) Prilosec (omeprazole) at one 10mg tablet per 20 to 40 pounds of body weight
every 24 hours.
These will reduce stomach acid and should help if this is related to simple nausea and gastrointestinal irritation.
I would not feed her any food for 24 hours even after the acid reducers are started.
This should help stop gut spasms and restore normal gut motility.
Small amounts of water or ice cubes given frequently are fine as she needs fluids after all that she has lost with vomiting and diarrhea. You can give her pedialyte to replace electrolytes too but Gatorade is much too high in sugar which can make her intestinal irritation worse.
Today even with the fast you can start Kao-pectate at 1ml per pound or 1 tablespoon per 15 pounds of body weight every 6 to 8 hours. This is quite safe and will coat her irritated gi tract as well as absorbing bacterial toxins. You can use it for several days until her stools look normal. You can find kao-pectate at the drug store.
If she has a tense painful abdomen, continues to have diarrhea after being on kao pectate for 24 to 48 hours, becomes very lethargic, begins vomiting again or runs a fever greater than 103.5F then she really must be seen by a veterinarian as soon as possible. Make sure to take a fresh stool sample with you when you go to make sure that gastrointestinal parasites aren't part of her problem.
If things are going well after her food fast start a bland diet of 1/3 boiled hamburger (or white skinless chicken), all fats and juices drained off mixed with 2/3 boiled, plain white rice. Feed several small meals a day. You might wish to add 1 tablespoon of canned pumpkin to each meal if you are seeing mucous in her stool as fiber helps soothe an irritated colon.
Once she feels better (no bloody diarrhea for 72 hours) start mixing in her regular dog food very slowly. Less bland more regular with each day. It should take a week or so to convert her back.
If Walker is continuing to vomit and feeling poorly though it would be best that she see her regular veterinarian now as anything you give her orally will just come back up worsening her dehydration.
Please let me know if you have any further questions.