This is Barry. Welcome to the forum.. Sorry to hear of your mothers problem.. Along with the biopsy, her dr will order many related blood tests. the dr will also order a mri with a contrast, to get more detail..they will scan her entire abdomen.
Until the biopsy is reviewed, theres not much I can say. Requesting copies of all her tests and scans is the right thing to do..The nodule could cause the symptoms you described.. If you want to read about liver nodules, I found a good website, that's easy to understand.
get back to me, when you get results. And the very best to you and your mother. I am going thru the same thing with my brother.