what i've been told is that breast cancer spreading to the scalp nearly never happens… same with finger tips - so people sometimes ice their finger tips during chemo to prevent problems with finger nails and neuropathy… same with preventing mouthsores - people often suck / chew on ice to prevent mouth sores from popping up.
i've seen mixed reports as to whether one keeps hair or not… the idea is that the circulation tot he scalp is minimized by keeping the scalp cold. personally, i was already so cold during chemo… i can't imagine having a cold thing on my head.
for me, the hair loss wasn't that horrible. but for some, it's like adding horrible insult to injury…
well - that's what i know. i hope that's helpful… hopefully, she's talked to her docs about using the cold cap and has made an informed decision that works best for her. if you can, just be supportive…
good luck!