I urgently need assistance!

I have a girl in mind, but it's not official yet. I've shared my feelings with her, but she values her independence. Unfortunately, she doesn’t seem to see that true independence in her situation is only possible with a supportive partner. Her home life isn't great—she comes from a conservative household and isn't even allowed to use public transportation; only the organization’s bus is permitted. I feel like I'm the only guy who genuinely connects with her. I'm her closest friend now, even though she turned me down when I confessed my feelings. She can't text me freely because her parents monitor her messages, so I haven't been messaging her much lately. However, we still spend time together at school. I’m in my final year of high school, and I only have seven days left. If I don't manage to get her into a relationship during this time, I might not have the chance to talk to her again. I'm reaching out because I could really use some advice. I know you all have more experience; I'm just 18 and could use some guidance. Please help me out!