The only way someone can be involuntarily admitted is if they are an immediate danger to themselves or others. If this this is the case, get her to a hospital. Otherwise just try to be supportive. Let her know that an evaluation would be a good option and you would be there to support her through it. You can't make her do anything she doesn't want to though. Her change has to be wanted by her. Sometimes though all someone in pain needs is someone that cares to say they will be there through their treatment.