Ismary~
Sorry you've had to join us here, but you'll find lots & lots of great advice & wisdom from this group. You're right, Her2+ tumors are typically more aggressive & insidious w/a higher incidence of recurrence & metastases. Naturally, you want to do everything to keep your mom in good health & this disease at bay.
If you do a search for Adjuvant Herceptin, you'll find many helpful articles citing the HERA trial
"...preliminary data from the HERA trial, suggest that adjuvant trastuzumab can markedly decrease the risk of recurrence for patients with HER2-positive early-stage breast cancer."
"...demonstrated a 52% reduction in risk of breast cancer recurrence as well as a 33% survival benefit with adjuvant trastuzumab therapy..."
(attached is the link to the entire article)
http://www.medscape.com/viewarticle/506111
I think it's definitely worth another conversation with your mom's onc.
However, what does your
mom want to do?
Ultimately it is her decision, but w/your guidance & support & advocacy, she'll feel more comfortable that she's so well informed & supported.
Best of luck to you both.
Keep us posted!
Keep the Faith~