Oh gosh, this must be so stressful on you too.

This is not the answer you want to hear... In most cases it takes far longer than 4 days for one's full diagnosis to come to light. These initial days are about stabilization. The hospital won't let her go until that happens. They may even wish to hold on to her until she shows improvement beyond that.

In the meantime, you need to look after yourself - don't ever forget your own needs and to keep an eye on your own mental health. Take advantage of the psych nurses and other staff to bounce your feelings off of.

Investigate whether there is a support group or support services for friends and loved ones of those getting care. Often these happen right in the hospital itself. My own father and son attended one of these and it quite benefited them; not only in learning about the illness and what is to be expected to come, but sorting out their own feelings about it.