My sister had a CSF leak last year. One day she had a horrid headache and vomiting. Diagnosed with migraine by family doc, but it didn't improve on meds so she went to ER that night. The ER doc did a spinal tap. She was hospitalized with IV caffeine and MRI the next day showed low CSF pressure. The ER doc didn't check her CSF pressure before the spinal tap, so don't know if her leak was from the tap, or a spontaneous leak prior to it.
Anyway, she would vomit INSTANTLY whenever she'd raise her head any. When they finally did a blood patch, she had immediate improvement. She still had some headaches and vomiting which waxed and waned for almost a month, but they were nothing like the ones prior to the blood patch. It was a very scary time for her and for all of us who love her, like it must be for you... watching your Aunt suffer and not being able to help.
Prayers to your Aunt and the medical staff caring for her, that they find the answers to make her better soon.