Pregnant at 19

Hi. My sister is 19. And she pregnant. She is emotionally sad. But she doesn't want to have a child at a young age. She has a job but her bf isn't mature enough to support her. I want my sister to keep the baby but the stuff she dealing right now at home is going to be even worser than it is . And also my sister is finishing up her pre requisit in college . I don't know what I should do to help her .