Generally when someone is admitted for a suicide attempt they are automatically admitted to a Psych hospital for approximately 10 days for evaluation and counseling.
Happened to my wife a couple of times. There was no being released until a thorough evaluation by the Psychiatrist was performed. This i for her own protection.
See if that is available. Of course it depends on her insurance.
Best of luck. You and your wife cannot handle this alone! You are right to not take her in as it will destroy your family.