Grandma surgery expenses

My grandma went to africa 5 years ago on a visiting visa stayed longer than what the visa said she should but anyways when she got back to the States her life and health issurance was cut off because she wasn't here although it was renewed while she wasn't. She came back to the states very ill, suffered from recurrent seizures that almost killed her and she also got one of her legs cut from the knee down from a disease called gangrene. Rightnow the gangrene has a chance of it spreading to the other leg and my family and I still are paying out of pocket for her other medical expenses for the last year. My family is in desperate help to make sure my grandmother's health is where it should be. Please donate anything, anything helps please guys i beg of you.