My Sister Thought She Had A Virus. Temperature, Chills, Vomiting

my sister thought she had a virus. temperature, chills, vomiting and diarrhea. She felt better for a day, started eating, held it down, then it came back. Gas, passing clots (not so much diarrhea) and vomiting. She feels weak, then it passes and she fells almost normal again. She cannot find a doctor that is accepting new patients and takes her insurance. Should she go to Urgent Care or give it a few more days?