When is it time to call Hospice or talk to someone about it?

So, my grandma has congestive heart failure and I'm just finding out she has had it for years. I have cared for her for 5 years and she's been on the meds for longer than that. Right now she has pneumonia that she got due to being in rehab untreated that we are working on. She does have fluid in her basil part of her lungs. Despite all that, she's walking, talking (sometimes to people we can't see but usually to use), interacting, eating with sometimes no assistance or with a little bit of persaussion but still eating, and overall still living with me. I don't mind caring for her as she's sleeping at night and still interacting with others, giving kisses to her great-grandchildren even calling them by name a lot. I just don't know in general when it's time to call Hospice or talk to someone about it. The doctor is still convinced she will get better and has put her back on her water pill. She has a cough but it's strong as she's still strong. They keep reminding me she has dementia so that's going to be the thing that takes her not something like this. What do others think? As long as a person is functioning, they are ok right?