We've had good luck.  My wife Deborah is ER/PR+ and Her2+ and has been
doing just swimmingly for more than five years.

I am both ER+ and Her 2+  I also had 3 types of very aggressive b.c., 9 of 12
positive nodes (although the first CT report said there appeared to be
remaining lymph nodes matted together), extracapsular spread, and extensive
lymphovascular invasion.  I was dx'd in 3/01.  I had a bilateral mastectomy.
Then I had chemo--4 AC and then 5 weeks of radiation.  I then had more chemo--2
Taxol and 2 Taxotere along with a year of weekly Herceptin.  2 months after
last taxane I started Arimidex (while still on Herceptin).  One week after last
Herceptin I had a complete hysterectomy and salpingo--oopherectomy.  I had
become hypothyroid and had had 3 unexplained attacks of acute pancreatitis 2
mos. after starting Arimidex (don't know if it is related but am also on Beta
Seron for multiple sclerosis which, in combo with other meds may have
contributed to that, although have heard that chemo alone might do it).  I also
then started taking prophylactic Doxycycline, Celebrex (800 mg/day--maximum,
safe level which has been shown to have anti-tumor properties), and then also
started Lovastatin (also shown to have possible anti-tumor properties).  
I also changed my diet radically at time of dx and began an exercise program.
I try to eat alot of vegetables and do vegetable juicing but have gotten a bit
lax for the past few mos--still do but not as much.  
I reduced intake of hormone fed proteins and milk products.  I only buy
non-hormone fed meats now although occasionally eat meat in restaurants.  I had
also been pigging out on cheese and stopped  that.  I drink alot of green and
white tea.  I reduced coffee intake considerably.  I used to have an occasional
glass of wine but stopped that.  However, I drink alot of red (purple) grape
juice along and also have aloe vera juice/gel--made for drinking (organic).
I also lost weight--and think it may have been the cancer--after  not being
able to lose weight with standard diets--I lost 17.5 lbs suddenly and then
reduced wt. another 15.  I did stop eating sugar and flour and processed foods
at the time as well as started exercising.  I am still doing that but gained
more than half back--despite low cal diet.  I am eating bread though...
Oh, and I also began long distance walking--did 2 of the 3-day, 60 mile breast
cancer walks (Susan G. Komen foundation) which reduced sudden onset of sciatic
pain (but also had started statin drug and doubled Celebrex at same time).  
I forgot--also take Zometa (IV infusion--at 'osteoporosis prevention dose'
every 3 mos.
Most tumor marker tests are normal.  Scans show liver lesion (hemangioma? but
tumor never ruled out) and several enlarged retropertioneal nodes and enlarged
aortocaval node.  I have  also had enlarged hilar node and other weird stuff
that shows up.
I recently had new Cellsearch circulating tumor cell (CTC) blood test which had
result of "4."  We still have not had clarification of meaning but that does
suggest that there are tumor cells in the blood stream.
The main type of b.c. I had was/is lobular which presents in different
ways--thickening--on scans both in breast and for metastases.  Scan reports
describe thickenings but nobody has said I have or don't have metastases.  I
also had high grade dcis with extensive comedo necrosis and a rare presentation
of inflammatory breast cancer (in nipple only--about 4" away from main lobular
tumor).
I am thinking about taking other supplements--particularly Ip6 (would buy
organic at health food store without additives).  I am debating about taking
COQ10--can't figure out if it is or isn't helpful.   I also add the spice,
turmeric, to my foods--also supposedly has anti-tumor/anti-cancer properties...

hi rich-
we've emailed before i believe...
i'm er/pr positive her2new neg.  i was diagnosed at late stage 4 over a year
ago.
i just got good news today, as a matter of fact.  scans show that all of the
organ tumors i had are now gone.  10 lung nodules, 2 liver nodules and one
on kidney... all gone.  my many bone mets are healing.   for the first time
since this whole miserable mess started, my oncologist threw out the word
remission.
i'm 38, was pre-menopausal at diagnosis.  i take femara daily, have zometa
infusions every 3 weeks and get zoladex implant every 3 months to keep
ovaries shut down.  i also take anti-oxidants, try to eat an organic diet
and take green tea.  on the other hand, i still enjoy my wine with dinner,
and i'm still trying to quit smoking cigarettes (yeah, i know).  i've cut it
down by 75% in recent weeks and plan to stop entirely in the next couple of
weeks.
i have a good life overall.  i deal with pain from the bone mets and the
treatment side-effects, but this news is the best i ever hoped for.
i consider it a success.
i hope that your mom has similar results.
good luck, rich.

-christina