Hi, breathless, welcome to PsychCentral.

If you can, I would schedule your classes next year so you have space in the "middle" between classes that is free; then I would figure out places to go in the day, the library, study groups, student union, counseling and just tell your mother you are at school, working. You can get some of your school work done some days so you do not have as much studying to do at home (and can spend more time with your mother, helping her with her chores or maybe starting/joining a mother/daughter group to learn English, etc.?)

It sounds like your mother may be worried and upset too? When we are anxious, and I'd be anxious if I did not speak much of the language, it can be lonely and scary. Maybe you can talk to the friend's son your father knows, who lost his father, and you and your mother can help his mother and you can maybe find others at university that have mothers like them and make a little community of students and mothers?

I think most universities have a commuters "lounge"? I would maybe spend some time there, see if you can meet other commuters and figure out a study group or something for when you are at school some days?