This is not an easy road to travel and I can only tell u my experience but that was when I was in college and I know have 2 collage age kids. One thing u need to do and I hope u will is contact the counseling department at your school.
Don’t continue to deal with the depression on your own or it will only get worse. I know how much u live your mom and want to help the best way u can help is to take care of yourself. Focus on school on your mental health. That’s what will help her the most. After my dad died it was just me and my mom. I know now didn’t then that she was severely depressed and needed help. But I was so wrapped up in it and so unaware. And I didn’t have anyone to help me to navigate thru it. When u finish school u can do what u can to help your mom. Getting thru school will help u both to get what u need and to be able to have a better life. You are a thoughtful caring young woman I’m sure your mom is responsible for that. You will be ok and so will your mom will too. I’m afraid we all face hard times and it seems like some have it harder than others. Please talk with a counselor at your school don’t try to face this alone. I wish u the best and my thoughts are with u. I believe you can do this and see your way thru.
Pam