Ok ladies I need some advice/opinions. My husbands grandma isn’t doing well at all. It doesn’t look…

Ok ladies I need some advice/opinions. My husbands grandma isn’t doing well at all. It doesn’t look like she has much time. We live with his grandparents so my daughter is super attached to her. Should I start explaining to her she’s really sick so she’s not tore up when she does pass? I don’t want to tell her she’s dying and make her upset. The other younger grandkids said yesterday maybe we should spend the night it’s her last Christmas. They have also said we are up her because grandma is dying. Their dad is a real piece for telling them that. I know my daughter is going to be really upset when she does pass. I’ve never had to explain this so I don’t know what to say. 😞