Herceptin and Failure to work???

Hello one and all:

My question is sort of technical, so I am hopeing for 1) Info or 2) palces to get the info.

Background:

Lori was dx Feb 04 with aggressive mets to most large bones hips and up. Was in sever pain and had breathing problems. Was dx er/pr+ and her2++ (almsot 3+'s). She was placed on a protocal of Taxol,carboplatin and herceptin. ( large doses). as the only real chance of any help. Given 10% to make yr. due to spread and aggressivness of disease.
The chemo was every 21 days for 8 cycles.
Near the end of cycles the bc. was seen as gone.
Herceptin was continued for 2-3 more cycles where upon bc returned. Aggressively. No real chance to mets as far as we can tell.

Question: Should she have been taken off Herceptin ( onc. said it failed to work)???

Question: Is herceptin a cure by its self or is it a helper drug for chemo's like taxol, carbo, etc.

Any help would be greatly appreciated.

Lori is presently experiencing her 2nd disappearance of the bc. No real change in the bone mets. except that it hasn't gatten worse??

Phil S-R