These questions like "why doesn't she simply x or y" make me sad. The person in the article is poor, not dumb.
She likely can't move. It's expensive to move, no matter who you are, and since she has two jobs, it seems like she's going to spend a lot of time on the bus no matter what.
She definitely can't demand McDonald's pay for a taxi, or she can ask, be turned down, and have her hours cut for next week. They'll cut her hours if she just leaves at the end of her shift, and they ask her to stay.
She's already doing something that could ultimately have a positive material impact on her life, organizing with her coworkers. It's just that the many interlocking systems around her life all work against her; bad public transit, bad pay for physically exhausting work, and having to fight so hard for something as basic as a union at her workplace.
This is a situation that calls for compassion, understanding, and working alongside her to change the systems that keep her in this situation, not suggesting "why doesn't she".