Dreams involving deceased loved ones, especially grandparents, can be powerful and often evoke strong emotions. In your dream, your grandmother appearing and delivering a message about your death can symbolize several things.

1. Symbol of Guidance: Grandmothers often represent wisdom and guidance. Her message could be a metaphorical warning or a nudge to pay attention to your health or life choices. It might be worth reflecting on your current lifestyle and making any necessary changes.
2. Fear of Mortality: Dreams about death can often reflect a fear of mortality, either your own or of those around you. This could indicate that you are processing feelings about aging or loss.
3. Transformation: Death in dreams doesn't always signify a literal end. It can represent the end of a phase in your life and the beginning of a new one. Your grandmother may symbolize the support you have as you go through this transformation.
4. Emotional Connection: This dream may also indicate unresolved feelings or a need for closure regarding your relationship with your grandmother or the themes she represented in your life.

It's important to remember that dreams are personal and can vary significantly in meaning. Consider how you felt during the dream and any current life situations that might relate to these themes. If you're feeling particularly anxious about the dream, speaking with a trusted friend or professional could provide additional support.