Is it possible to get gangrene from a sunburn?

my sister got sunburned yesterday, her face is red from the burn. Today we r planning on going out and my mom is telling us she can get gangrene or something like that cause she is sunburned. I think my mom is just saying that so that we dont go out, but i still want to make sure....can she get that from a sunburn... show more my sister got sunburned yesterday, her face is red from the burn. Today we r planning on going out and my mom is telling us she can get gangrene or something like that cause she is sunburned. I think my mom is just saying that so that we dont go out, but i still want to make sure....can she get that from a sunburn if she goes out?
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