Rare? Her2+, ER+, PR+

My sister (Julia) is Her2+, ER+, PR+. Her second opinion doctor says this is rare. She is being treated with Herceptin and Taxol, which both docs recommend. However, doctors disagree beyond the first 12 weeks of treatment. One says to have the surgery, followed "ac" and radiation. The other says to start TAC for another 12 weeks, then surgery, then radiation. Anyone following either of these treatments and are you +, +, + and do you consider it rare?

Other info: Tumor was 4.5 centimeters in June. Just one month later it was 7 centimeters. She's not been tested for Bracha but our Mom had the same type of cancer (lobular) so we are thinking genetic?.

Would appreciate any info.

Elizabeth