Can a benign lesion on the liver metastasize and cause severe pain in my 60-year-old mother?

Hello doctor,

My mother had severe pain in the liver about three weeks ago, and she had breast cancer two to three years ago and was treated by mastectomy, radiation, and estrogen blockers. She did not have jaundice, vomiting, blood in stools, swelling of the limbs, and bruising. They achieved clear margins and a normal mammogram last year. She never had any liver problems, and I am worried about hepatitis C. Before the treatment, they said that the lesions on the liver were benign. So that brings me to three weeks ago, she had severe pain in that area and went to the emergency room (ER). They did a computed tomography (CT) scan and said it had metastasized because of the inflammation and enlargement of the liver. However, she had an abdominal X-ray two weeks prior, and there was no evidence of issues. Does pain from metastasis and inflammation usually happen abruptly or lessen over time? Since then, the pain is still there, but significantly less than when it first appeared. What is the likelihood of this being a metastasis or something serious? She is 60 years old now and has no other related health issues. She will visit her oncologist tomorrow, but I wanted some reassurance from you. She has not had any sign of jaundice, and no abnormality was seen in her blood test.