Please help my mom to live without mold

Hello to all kind souls out there. My name is Lara and I'm addressing you with a big request. It's hard for me to ask for help, but I just don't have a choice. It's about my mom's apartment. My mom always took care of me, there were always just the two of us, we don't have many relatives. She is a cancer survivor. She works two jobs, which are extremely poorly paid.

Her apartment is full of mold and needs renovation.The apartment is half basement. Living with mold is a big risk for her health. It is necessary to replace the windows and install 3 air-filtering devices. We received a pro forma invoice of € 8000. Currently there are two devices in the apartment that help to destroy the mold and consume a lot of electricity. As soon as you enter the apartment you smell mold. I would love for my mom to keep the apartment, because the apartment is my grandmother's legacy and the home I grew up. Otherwise, it will need to be sold. We would like to have new windows installed this spring or summer because the situation is really unbearable. Many times I don't sleep because. I'm tired and exhausted of fear. I hink about this all the time, I really ask for your help. Thank you from the bottom of my heart