Dear Rinaina,
As stated previously BRCA and Her2 are completely different "animals". I do know a few who were both BRCA + and Her2+ (can't remember er pr status). In fact one of those fine ladies sent me to this site.As far as I know Her2 hasnot been deemed "hereditary".My Mom was not Her2+.
The BEST advice that i can give you would be,as the others have stated, is to see a certified genetics counselor, here is the link to do a lookup for one in your neck of the woods...
http://www.nsgc.org/