i had stage ii breast cancer, and i choose bilateral mastectomy. i choose to do both for several reasons, including a desire for symmetry and a fear of being in for biopsies every time a new bump or lump turned up. i had bumpy boobies.... i also did not feel the need to simply have breasts. so, i opted against reconstruction.
so, there are a lot of things to consider...
1) does your mom want to have breasts when it's finished? in other words, would she want to either do lumpectomy or mastectomy with reconstruction?
2) if your mom does mastectomy, would she do a single or a double?
mastectomy plus reconstruction is a big deal. it seems i hear about people having problems with the reconstruction phase fairly often. the mastectomy alone is really not that big of a deal. you do end up with drains for a week or so... but, overall, the recovery is not so bad.
for me, i love being flat. i chose bilateral mastectomy with no reconstruction. i do miss my nipples, but i am joyfully flat. anyway, i was back at work the week after, and, really, it was all very manageable. every one is different, though. i gather my recovery was quite a bit faster than the norm. but, then again, i'm a stubborn little bugger.
does your mom need to do chemo? i hope that she does not have to...