1) Are you using mAndy or D2jsp.
2) Is your char a sorc
3) Is your sorc a fire or ice sorc.
4) Get max resist, Poison resist perfered. get a a2 or a5 merc to tank, give it dr or max its's resist also.
5)Go for + skills instead of too much mf, the faster you kiill her, the more runs you can do.