Thanks so much. Okay, first of all she needs to see her primary provider who can order tests to see what is wrong. At a minimum, sShe needs medication to cure her Hep C.
She needs to stop using drugs.
Memory loss is more likely from drug abuse than from Alzheimer's.
There are more than a dozen causes of upper left abdominal pain including reduced blood flow to the heart (angina), diverticulitis (a colonoscopy diagnoses this), enlarged spleen, bowel impaction, stomach inflammation, hiatal hernia, kidney stones, pancreatitis, etc.
The hot flashes may be from early menopause, but she would need to see her gynecologist for a diagnosis.
Pain in the hands and arms can be from loss of proper circulation, or from compression of a spinal nerve.
However, she needs to see her primary care provider to get started with systematic testing. The ER is for, well, emergencies. They look for a cause for the immediate problem and send you to your primary provider for follow up treatment. They aren't for diagnosing chronic ailments, and frankly we don't do a very good job with those. Her primary provider will be able to send her to proper specialists to get her diagnosed properly.
Please let me know if you have questions.