Re: shadow on an x-ray ...
I'm so sorry about your mom. I really hope you get some uplifting answers. My mom died just over a year ago from lung cancer. She wasn't diagnosed until the late stages and it had gone to her brain. She was sick, but we didn't know how sick. She only lived a month after her diagnosis.
Your mom might be okay. I'm sure she feels terrible and has this feeling that something is not right, but maybe its pneumonia or something else. I really hope that it is something else.
Best wishes to you and your family. You will be in my prayers.