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Hello, this is Dr. Jess. I am sorry about your dog Heidi. Did you already take her into the vet tonight?
Based on your description of Heidi, my concern is that she could have a syndrome called Hemorrhagic Gastroenteritis. With it we can see vomiting and diarrhea that can sometimes be bloody or seem like it is all blood. This can be a very serious illness and does require veterinary treatment ASAP. I have attached an article here on HGE: http://www.veterinarypartner.com/Content.plx?P=A&S=0&C=0&A=2946
HGE can cause a dangerous drop in blood pressure due to fluid loss, so many dogs do need at least temporary IV fluids and anti nausea injections. If you didn't get her in yet, I would bring her in ASAP. In the meantime, if she has continued to vomit, do not offer her any food or water, as she is likely to just vomit it back up until she gets some antinausea medicine and the vomiting will cause increased dehydration. I hope this information helps you and that you are able to get her in to see the vet for treatment.