Having been told you have TNBC is a frightening thing not only for the patient but also the family. I lost a sister to bc and have several cousins with bc. I have had a mastectomy, chemo and radiation and only once my treatment was completed did i think about having genetic testing done. I don't have a mutation in the BRCA1/2 genes but rather a mutation. So this is still a gray area and the experts can't say definately that this is cancer causing even though 2 of my cousins with tnbc have the same variant. I just found it easier to focus on one thing at a time. My priority was to be rid of the cancer in my body, get healthy again then look for the cause and what I can do to prevent it coming back. I think the trick is not to get overwhelmed with all the information out there. I think you and your family do need to be a little more vigulant but even not have a family history will not stop you from getting cancer. There are things in our everyday life that we can do to reduce our risks regardless of the genetic side of it.
I think the wire thing you refer to may be a fine needle biopsy. That may be the test that she is having to determine if the 'spot' is something that requires further investigation.
I wish your family all the best and my love and prayers go out to your mum.
Tintin xx
PS keep us posted on your mums progress