How can I switch to hardcore for a sorceress on hell. I've done 100+ runs on the nightmare but haven't gotten anything to put on it. please tell me a build on how to dress a sorceress from a nightmare so that she goes to hell?

blizz for farming hell

I play hardcore. how to dress her in a nightmare so she lives in hell?

First off 100+ runs=Nothing in a game like D2, Add a 0 to that and you may find a few usefull items.
Also depends on where you farm, NM Bloodmor probably wont net you anything, but 1000 Baalruns probably will.

Runewords can help get you survivable
Rhyme shield (Shael Eth) gives resists, magic find and decent block rate
Stealth armor (Tal Eth) gives FCR and FRW
Spirit weapon (Tal Thul Ort Amn) give FCR, skills, mana, FHR
Lore (Ort Sol) gives skill and lightning resist)

If you manage to get a Spectral shard and magefists for 70FCR, then you can make Smoke armor for high resist (Nef Lum)
NM Cows can be a nice sorc of charms to add life/resists

Try to get 63+ FCR, positive resists then goto hell act 3 and moat trick Mephisto, he will gear you if you run a few 1000 times.
If you want to be safer, farm NM Andariel untill you get a Soj, trade it for something useful

yeah, farm countess for runes to get all these runewords above...
and make chaos runs for uniques

also u can craft a caster belt for 10 fcr
gamble or craft fcr rings/anulet and frw/res boots

try to stash something for merc - in hell u want him at least as meat shield '-_-'
insight and blood crafts, if u dont find something better