I did some reading of past Breast Cancer Update: Patterns of Care publications
http://www.patternsofcare.com/issues.asp, and it seems that offerring Herceptin to patients with tumors under 1 cm. who are hormone positive has been a controversial issue among practitioners. It could be community practice where you live. This is not to say you should give up - continue to seek other opinions and insist on it if you must.
Hopeful