Hello, My Aunt Is Dying. Her Brain Is Shutting Down,

Hello,

My aunt is dying. Her brain is shutting down, and the dead brain tissue cells are filling up with fluid. Her kidneys are shutting down too. She's been diagnosed with having both sepsis and uti infections spreading her brain. As of yesterday, she began foaming at the mouth. Can you explain why she's foaming at the mouth? Is it due to her brain shutting down which controls all other organs and it's affecting her respiratory system and she's struggling to breathe? Gases and salvia mixing causes foam/froth?