What can be expected after finding out you have a malignant tumor in your breast?

Not me. My mom received her results today from a biopsy performed yesterday. She has a very small malignant tumor in her breast. She’s in her mid 70s.

I don’t know a thing about breast cancer, so I’m hoping some of you who do can walk me through this process. My mom is a very fragile person and I want to support her as best as I can.