Hi Jeska,
It is only natural for you to wonder - about everything. Your mother has entered a whole new world, where we have to acquire a whole lot of knowledge about stuff we would rather not know. It will be important for you both to remember that this disease and its treatment are very individual - what works for one person may not work for another. The doctors tell us that it can often be managed like a chronic disease; I guess that's what we hope for, that we can live as well as possible without too many side effects.
I haven't had Abraxane, but understand it is relatively bearable and I hope your mother has a good response. Herceptin is likely to be a long term treatment, but doesn't have many side effects at all - on its own, the hair grows back again! Feel free to ask questions here, and maybe your mother might be interested in the site as well.
Best wishes to you both.... Pam