Mom with signs of dementia and severe depression...where should I take her?

I recently posted about my mom who has yet to be diagnosed. We can't get her into the car to see a doctor. I had mentioned her combative personality and today she has been crying on and off. Sobbing, actually. This crying seems like a mental breakdown and has been happening on and off for weeks. She says she has nothing to live for and talks about death often. She never says she'll hurt herself, but says she's through living. If we call 911 she could probably calm down enough that they wouldn't take her in. I mean, she's not physically trying to harm herself. IF I can get her into the car...where should I take her? Urgent care or emergency? What if I can't get her into the car? I just feel sick tonight. I hate that she's hurting. I want us all to have great memories of her.