What would you do for someone who makes suicidal threats?

We have a close relative with a lot of issues. She's in her 50's, divorced and single, lonely, terrible financial situation (in a lot of debt, no retirement, shitty job), probably an alcoholic. All those issues have lead to depression.

She's always been a very dramatic person who exasperates her problems and likes the attention. The thing is, the past year or two she has repeatedly mentioned that she wants to kill herself. Friends and family have tried to tell her repeatedly that she needs to seek help, but she never does. We've also started to become desensitized to her suicidal talk because of her dramatic demeanor and her excessive use of it - ie. it has become easy to brush off that she isn't really serious and will come to her senses.

Regardless, her behavior isn't normal and there is no denying she is having suicidal thoughts- regardless of her level of intent to actually carry through. I think eventually without help she will reach a breaking point and do it. But, as many times as we've talked to her and tried to have her seek professional help- she won't do it. Is there any other option out there? I'm not sure if you can contact police or medial authorities for suicidal threats, or if that is even too harsh? Feels like one of those situations where they have to want help before they can get it themselves, and there's nothing really we can do, but just trying to think of any other options, if any, we have?