Marion-
I was 48 at dx in 06 with stage 1, grade 2, ER+/
PR+/Her2-. I too have a family hx. I did have genetic testing and was found negative for BRCA genes, but I DO believe there is probably a "faulty gene" as well, for those of us with a family hx, but NOT BRCA positive. - they just haven't discovered it yet.
As the other poster said, invasive cancer is always serious d/t some risk of recurrance. A grade 3 can be a little more aggresive, so it is good your daughter is having chemo.
It really is a crapshoot as to who recurs, but there are many, many women who will be fine after treatment. I am almost 3yrs out and doing well.
Leea