She needs intensive care and management

If she expresses active suicidal ideations and making a plan to kill herself, these are the telltale signs to get her admitted at the psychiatric hospital and start intensive treatment. Crisis intervention is necessary in this.  As of now you can keep a scrutiny to minimize the risk.

As a bystander it’s really hard to manage such problems and she would definitely need an admission at psychiatric facility for constant Observation

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If she is having active suicidal ideation (strong intention of killing herself) then I would suggest that she be admitted in a Mental Health Care facility and treated under constant observation and if needed, given Electro Convulsive Treatment (ECT) which happens to be very effective in decreasing suicidality. The medicines need to continue during and after the ECT sessions.