HI, My Mother Had Neumonia About Two Weeks Ago, And

HI, my mother had neumonia about two weeks ago, and now she is surfing from pain in the mouth and throat , can't eat or she will vomit, she said that her throat feels like it on fire, and it's a lot of pain? I'm giving her only vegetable broth, no sugar, or milk, and that's all she can keep down, I give she lots of water and cranberry juice and gator aid? But the pain is not get in any better. Please help,