my sister fell into a hole and got gravel poured all over her
Dreams about siblings can often represent your relationship with them or reflect your personal feelings towards them. The image of your sister falling into a hole and getting gravel poured on her may symbolize your own fears or anxieties about your sister in some way. Perhaps there is a situation in her life that you feel she is sinking into or struggling with, and you feel powerless to help her. The gravel in the dream may represent obstacles or challenges in her path.
Alternatively, dreams about falling can sometimes indicate a loss of control in one's life. If you feel like you are losing control of a situation or your ability to help your sister, this dream could be a reflection of that feeling. Consider whether there is anything in your own life that makes you feel like you are sinking or being buried under pressure or responsibilities.
Overall, the dream suggests that you may have some concerns about your sister and her wellbeing. It is worth considering what these concerns might be and whether there is anything you can do to support her in a practical way.