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Sine she is breast cancer survivor, it is more likely that she has metastasis of breast cancer in liver rather then a new liver cancer
. Scans and fine needle aspiration biopsy
will confirm that.
If it is metastasis and there is no disease elsewhere- she will benefit more from local therapy.That is treating only the tumor.Ideally surgery of tumor is best treatment if it is operable. But I doubt she can undergo surgery because of her advanced age.
Other minimally invasive procedures
like radio-frequency ablation or non invasive procedure like Stereotactic body radiotherapy(SBRT) can be an option.
If it turns out to be breast cancer metastasis
and hormone receptor are positive she will benefit from hormonal therapy.
will have limited role and is very difficult to administer in 83 year old patient.