When you arrive in the area for the final time, head around to the right. Do not Mass Haste immediately. Wait for the cutscene with the sorceress to finish. NOW cast the mass haste on the party. Spellcasters other than the Mass Haste caster can cast ONE quick spell each. But no more than 1 spell per spellcaster (all cast at once). The extra protections are not going to matter much. The quicker you can get to the Sorceress, the more time you have to shut her down.
Now run to Archon. Do not wait for the entire party to reach Archon; it's not necessary. When the very first person reaches Archon, speak to him and go to the embassy.
There are a number of potential spells that you can try to inhibit her ability to cast the Time spell: Insect Plague, Symbol Stun, Holy Word, Otiluke's Resilient Sphere. Probably others as well. A Protection from Magic scroll supposedly works wonders, as well, and cannot be resisted.
Last time around, I nailed her with the Otiluke's Resilient Sphere spell. Didn't realize that it had succeeded for a while. When I did, I switched to killing her allies.
After her allies were dead, I switched to nailing her with my tanks and returning arrows/bullets so that I wouldn't waste ammo. Why? So that I could look away from the screen without her sneaking out of the spell. This way my party was beating on the sphere and when the sphere went down, they were still swinging away. BTW, the ORS lasted longer than her spell protections. So she was completely vulnerable when the ORS expired.
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