My mom 45 years old, has 2nd stage breast cancer as said by doctor.

[Neah27]

My mom had 4*4 cm lump in right breast with palpable axillary lymphnode.Her post op HPE Infiltrating duct carcinoma grade 3(NBR SCORE 3+3+3=9), 12 lymphnodes isolated, one is involved by tumour., ECE  present.
ON IHC ER +ve80% moderate,PR+ve80%, her2 NEU by fish+ve.

She has completed two doses of chemo of adriamycin and cyclophosphamide.
She need to Go 2 cycle more of this, followed by Taxol injection 12 sittings,then hormonal therapy followed by radiotherpy.
Doctor said then, she has to take some medicines for 8 years(didnot tell medicine name, i am guessing it might be herceptin).
The thing is i am not getting if she is her2+ve?? I got gloomed out when i heard that my friend's mother too had stage two breast cancer, and was given herceptin, but after four years, she was diagnosed with cancer, but it had already affected her lungs. It was too late. It is making me cry, i do not want to lose her. Please let me know, about survival rate, and recorrence rate. It is not hereditary.