Also, biopsies and scans can only tell them so much. Once they remove it surgically they will know the exact size, it's appearance, whether they got clear margins (which they want) and they'll send it to pathology who will look at it again. But they already know it's grade 3 which is an indication of how fast the cells are duplicating.
The staging is important. If it's still only in the breast it'll be stage one or two which is the holy grail. Stage three means it's gone to the arm pit lymph nodes and the plan looks to be to check whether this has happened and how many it's gone to (the fewer, the better, the lymph nodes are like doors in a tunnel and you want to hear it's not got past any of the doors so to speak. If it's just in one or two nodes that's better news.
I suspect they'll then do rads. Probably 30 days. That's manageable.
Then they'll talk about chemo. If she's elderly she or they may decide not to do it, and some breast cancers don't warrant it.
At some point they'll want to do a CT scan. This is to see if it's spread around the body in which case it's stage four which is a whole new level of shit ness. But they might do the lumpectomy, and rads before that. I think it'll depend on what they find in the lymph nodes as to whether they recommend chemo and how quickly she will get a CT scan.
Hope that helps. I am a ten year breast cancer patient. My lump was 7cm, state three grade three, then stage four.