Positive BRCA1

I just got my results back yesterday. I have the mutation Deleterious in BRCA1 gene. It wasn't much shock since my mother had breast cancer also at 35. I now worry about my sister almost 20 and my daughter 9. I've been reading the book Pretty is What Changes. My sister is thinking about going with the Prophylactic surgery (preventive mastectomies) like the writer in this book. My sister has not taken the test yet but this is what she's thinking if she does have the mutation. I wish I would have taken the test sooner, I may have went the same route. Probably more than likely if I was able to have immediate reconstrution. So with my new findings as of now I intend on get an Oophorectomy ( removal of ovaries ) I'm still reading on this, but I am done having children, I had my tubes tied in 07, that was a waist. So I really don't have alot holding me back. Anyone with any experience personally advice welcome.