[Ishpah]

I don't know what to tell you first. I think that starting a prayer chain for her recovery would be of utmost importance and the sooner the better.
Secondly, you indicate her symptoms are worsening by the day. You need to get her to that biopsy ASAP. How do you do that? Well, her attending physician would be her first option, but, maybe it would expedite things if she was taken to emergency. She needs to be at the head of the queue. Time is of the essence and a biopsy can be done after the tumor is removed.
Her cancer is aggressive by the sounds of it. She cannot do it alone. You have to hold her hand and demand things get done.