Paget’s disease without breast tumour?

Hi everyone. English isn’t my first language so sorry if sound illiterate. My mom (47 y o) got biopsy results and the diagnosis is still unclear! biopsy says they still can’t define if it’s Paget disease of the nipple (no breast tumour found, only benign fibrosis) or skin cancer on her nipple.

"Within the cytogram, it is difficult to make a differential diagnosis between Paget's cancer and dysplastic nevus."

Mammogram — only microcalcinations. MRI has large area of inflammation but the biopsy didn’t found signs of malignancy so it’s benign mastopathy. Can you please give me advice what to do? What type of cancer is more dangerous? Feel helpless and need help. Will appreciate any information!