My mom might have cancer?

I don't what to do. We don't have money or insurance because we can't afford it. I don't know what I'd do without her. She had some kind of pre-ovarian cancer when she was in her 20s and it went away...But she thinks she might have skin cancer. She's a nurse and she said she's seen it before and now I'm really scared. I don't want to lose my mom when I'm 16. I've heard melanoma can kill people and I'm just really scared. It's just her, me, and my two sisters. And... I guess I don't really have a question. I'm just scared for my mom and wanted to get it out.