Negotiation Crucial?

I have broken up with my girlfriend before but this time she is being in the depths of despair. I received a call from suicide prevention/intervention hotline and was told that it was absolutely necessary to talk to my girlfriend as she is in the commence of a life-threatening conduct. I was told to cooperate—by saying positive things about her appearance especially her hair, avoiding saying no and say things like—you sound frustrated or angry. I am not a negotiator. Shouldn’t she be committed to a mental hospital? Isn’t me talking to her might trigger suicidal actions?