Friend, vomiting and diarrhea can be caused by many different conditions. It will be difficult for me to determine the exact underlying cause without a hands on examination and some testing. But, common causes are: Dietary indiscretion, ingestion of a foreign body, infections or even part of a systemic disease to name a few causes. As far as the bruising, this could be related to a completely different problem like: Trauma, localized infections, etc. Less likely we can see bruising of the skin with certain systemic diseases like thrombocytopenia (decrease platelets). For this reason I would strongly recommend having her checked by a veterinarian as soon as you can. In the meantime this is what you can do:
1- Do not give things like Pepto Bismol or imodium. Start her on Pepcid AC (famotidine) 10mg 1/4 tablet every 12 hours for the next 2-3 days. You can buy Pepcid AC over the counter in any pharmacy.
2- No food or water for 8-12 hours. Need to give her gastrointestinal tract time to rest. Keep her indoors in a cool room when fasting.
3- After 8-12 hours offer a small amount of water. Wait half hour, if no vomiting, offer small amount of rice (50%) and boiled boneless chicken or ground beef (50%) 4-6 times a day. Keep on this diet for several days then wean into regular diet.
4- Follow up with a veterinarian for a hands on examination.
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