Her2 Score Question

[Hello!]

I'm sorry I don't have a lot of information. Just spoke w/ doctors yesterday about treatment plan. Invasive ductal--9 mm. Doctors couldn't feel any swelling in lymph nodes, but oncologist said could feel tip of liver. Her2 was a bar graph. I didn't see any numerical scores, and the doctor didn't mention any, but she said normally, the range on the graph would be @ 8 or 9. The Her2 on the graph yesterday was 100. The first two doctors (radiologist and surgeon) did not have access to the Her2 score at the time we spoke w/ them. Oncologist prescribed Tamoxifin(?) and scheduled a CAT scan. Was feeling really great after speaking w/ the first 2 doctors and even w/ the oncologist--until she received the Her2 score and palpated the liver, and the plan seemed to change. The first two doctors hadn't seen the hormone receptivity test or the Her2 when we spoke w/ them. Can anyone shed some light here? There was very little time for questions after the new report arrived as the lab was closing and there was still lab work to be done. Forgot to mention--was just diagnosed last week.
Thanks much