I'm going to tell my roommate that she doesn't care about her job
Why do you think she doesn't care about her job?
It is because I am so busy working and she can be lazy.
I know you are concerned for your roommate, but you have no right to tell her that she doesn't care for her job. You are not her, and can't speak for her feelings.
She will be happier if she can make me proud.
Even if she doesn't care about her job it shouldn't matter as long as she pays her bills. The only reason to mention it would be if you knew of a job that you knew she would enjoy.