Her testing should include a neck to knee MRI, a CT scan, and a bone scan. What type of treatment does her oncologist intend to use? Depending on the treatment, a bone density scan is in order too. Is she HER2 positive, or negative? Is her cancer estrogen and/or progesterone receptive? It should read something like ER+/-, PgR +/-, HER2 +/-
What stage have they determined her at?
Sometimes, it's best to do the treatment first, then the surgery. It may be easier to heal, and less stressful on the body to do the surgery after the treatment has stopped, or radically slowed down the cancer activity. These are things she needs to be addressing with her oncologist, not just the surgeon.
Her ER, Pgr, and HER2 factors, she might as well commit to memory, as they will crop up from time to time, in years to come, and she will be expected to know them.