searchig for info

Hello everyone
I have spent whole day reading your messages. Sorry for my English, it is not my mother tongue (I'm from Bosnia and Herzegovina). Well, I am here because I want to help my good friend. She is diagnosed with breast cancer 3 years ago, had breast removal, chemotherapy and radiation but her cancer is back. She is HER2 +3. Her oncologist suggests to take Xeloda. I am wondering does this drug have influence to HER 2. Is it better to take Herceptin although cancer have not spread to bones, lungs, liver…….

Thanks you very much