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.
Next Steps
Admission in a Mental Health Care Facility
Health Tips
Constant Observation so that the patient doesn't harm herself