Is it normal not knowing how to start a new life?

This story is about my mother. She met my father when she was 15. They had an on and off relationship... and meanwhile, she went to the university. She was poor, so she always had to work and study.

She finally married my father when she was 30. She had 4 kids afterwards, all while keeping her job at an hospital. She never had time to study more or to get ahead in her job, because she had to be a housewife as well (yeah, my father was always kind of a lazy sexist kind of guy).

And well... now my mother is almost 60. Me and my siblings are all about to finish the university, we all work and we take care of the house. We are all thinking about moving to live by ourselves soon. My mother is thinking about leaving my father as well... However... she is going through depression now... and her therapist told me that she doesn't know what to do with her life now.

My mother never had time for friends or hobbies. My family is all she ever had. She likes her job as well I guess, but she knows that she will never be able to achieve anything important, since she never had time to study more or attend seminars or that kind of things.

She is thinking about staying together with my father, since she dedicated all those years to him already.

And well, I just want to know if anyone had a similar case, and what should I tell my mother... thanks for reading!