Elderly relative severe depression

[Faciadipasta]

Can anyone give any advice please? I've posted on here before about my gran who is 96 and refuses all outside help.
She is obviously severely depressed (along with lots of other issues) and keeps ringing me and another family member in tears, multiple.times a day saying she doesn't want to live. She refuses to see the doctor or move into a retirement community- or even have anyone come in except family in case they steal from her. However harsh it sounds I don't have time to speak to her every few minutes, I'm working and I have young kids to look after. What can I do?
The most frustrating part of the whole thing is that we've found a lovely retirement home where she could be part of a community that I think she could be genuinely happy in but she goes nuts and starts shouting at everyone and point blank refuses to consider the idea when we bring it up. Can anyone offer any advice please? Or failing that has anyone experienced similar? Thank you

Just wanted to respond to you and sad that no-one else has.
You need to get together as a family to establish the way forward. Does anyone have power of attorney? Can you contact your local council social services department?
My Mum isn't a bother but she needs a lot of care. But recently she was saying the same thing. She was in hospital at the time and was put on anti-depressants. This has changed her outlook to being a bit sunnier. Is there an option speaking to your Gran's doctor with your concerns? As a family we had lots of help from social services, the NHS etc. We are in Scotland though so don't know how it works elsewhere but worth asking your local council for starters. It's so hard and you feel guilt ridden a lot.

Agree with @Limesaregreen
Also ask the manager of the care home if they have any suggestions.

So difficult.
MIL, 89, spent 15 months objecting to going into a care home even for respite. She was a prisoner confined to a bedroom and bathroom for nine months and was v angry and low mood.
She did get some meds to try to lessen her
aggression.
Family had to wait until she tripped and fell before they could get her in an ambulance to hospital and was transferred from hospital to care home.