Now I am glad to hear that her gums are normal and in that case we'd not be overly worried about pink tinted vomit. While it is often due to a small bleed in the throat from the force of vomiting or irritation stomach acid causes when brought up; those pink gums tell us that Willie hasn 't severe bleeding or anemia. So, we can breathe a sigh of relief and don't need to rush her in if she hasn't those emergency signs I asked about.
Of course, with her vomiting, we'd have to be wary that she has caught a bacterial or viral gastroenteritis, or has pancreatitis, parasites/protozoa infections, general dietary indiscretions, and ingestion of harmful items (hopefully less likely for Willie). With this all in mind, we can try some home supportive care to try to settle her stomach. To start, if she hasn’t just vomited (since otherwise we’d need to rest her stomach for a few hours first), then you can consider treating her with a OTC pet safe antacid. [ie Pepcid (More Info/Dose @http://www.petplace.com/article/drug-library/library/over-the-counter/famotidine-pepcid), Zantac (More Info/Dose @ http://www.petplace.com/article/drug-library/library/over-the-counter/ranitidine-hcl-zantac))]. Whichever you choose, we’d give this 20 minutes before food to allow absorption. Of course, do double check with your vet if she has a known health issues or is on any medications you haven't mentioned. Though if you give this and she cannot keep it down due to nausea that is usually a red flag that we need to bypass her mouth with injectable anti-vomiting medication from her vet.
Afterwards, you can consider starting her on an easily digestible diet like cooked white rice with boiled chicken, boiled white fish, cottage cheese, scrambled eggs, or meat baby food (as long as its garlic/onion free). The aim of these diets is that they will be better tolerated/absorbed by the compromised gut. Therefore, it should get more nutrients in and result in less GI upset. As long as improvement is being seen, I usually advise continuing this until the signs are settled, and then weaning her slowly back to her normal diet.
Overall, her signs do raise a few concerns here. but this pink tint just suggests that she has throat irritation from the vomit. Therefore, we’d want to start supportive care to settle her stomach. If she cannot keep that or water down at any point, appears dehydrated already, or doesn’t respond to the above by the time her vet is open; then we'd want to get her vet involved. They can assess her hydration, rule out fever, make sure there is nothing in her stomach that shouldn't be there or any sinister viruses present. Depending on their findings, her vet can treat her with injectable anti-vomiting medication +/- antibiotics to settle her stomach, and get her back feeling like herself.
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