S.H.
prayers to you & your family.
Hit the Komen (& others) website, & there will be great resources there to lead you thru the process.
CaringBridge.org is a great resource for communicating with friends/family as to updates. I used it with my son's hip replacement surgery....one post & the whole family knew what was up.
As for support: keep the house stocked with drinks & fav foods. Keep a support team readily-available. Be prepared for emotions...& embrace them! Don't hide them!
Create a hospital bag for her.....you will be amazed at how much of a difference it makes. I always include new toiletries, hand lotion, chapstick, soft Kleenex (not the rough hospital ones) or an antiq hankie, a puzzle book, a paperback...or Bible verses. Gum, mints, fresh fruit, pretzels....I also include PB, chocolate, & sometimes even beef jerky. A small neck pillow, a new robe/gown, new houseshoes. OH, & most importantly, a notebook/pen for jotting down all instructions!
When my son went thru his surgeries (4 for his hip) & my DH's heart surgery, I went loaded for bear! With each surgery, we adjusted what was needed in "the bag". It truly did help us get thru living at the hospital!
It is amazing how many changes have evolved in the field of breast cancer....so much easier on the patient! Thoughts & prayers sent your way.