This is no doubt a scary time for her. I am a 2x breast cancer survivor. My first diagnosis came when I was 34 (that was 16 years ago) and we lived in NJ. My reoccurance was 5 years later and we were living here in AZ but unfortunately the surgeon I had is now retired. It has been 11 years since my mastectomy (it was my 40th birthday present!). Anyway, although I cannot recommend a surgeon I do want to tell you that, God forbid if she'll need one, I can highly recommend an oncologist and also a plastic surgeon. I had the ultimate reconstruction and it went very well....no problems whatsoever.
I also want to give you a hotline number for an organization that I volunteer for. It's a support group for people with b/c called Bosom Buddies of Arizona. The hotline number is: ###-###-####. When you call the number you will be connected with one of our many volunteers who have experience b/c and can be of great support to your cousin, if needed. Check out our website: http://www.bosombuddies-az.org. There are several locations in the valley that she can join in on support group discussions. They meet once a month and everyone at the session is a survivor.
I pray this is not the case for your cousin but she should know, we have come a long way with treatments and there is much hope for all who are diagnosed with this nasty disease. The sooner we are treated the better. Many women have lived long productive lives after breast cancer, including having more children, just like I did!
I wish her the best.