[Lava]

I don't think it's as simple as setting some variable. This is the script that applies / removes the penalties:

Code:

IF
  !Global("LaViconiaState","LOCALS",1)
  !HasItemEquiped("%symbol_shar%",Myself)
  TimeOfDay(DAY)
  AreaType(DAYNIGHT)
  AreaType(OUTDOOR)
  !AreaType(DUNGEON)
THEN
  RESPONSE #100
    SetInterrupt(FALSE)
    SetGlobal("LaViconiaState","LOCALS",1)
    ApplySpellRES("LaVSun",Myself)
    DisplayString(Myself, @2000)  // Day blindness
    SetInterrupt(TRUE)
END

IF
  !Global("LaViconiaState","LOCALS",0)
  OR(4)
    !TimeOfDay(DAY)
    !AreaType(OUTDOOR)
    AreaType(DUNGEON)
    HasItemEquiped("%symbol_shar%",Myself)
THEN
  RESPONSE #100
    SetInterrupt(FALSE)
    SetGlobal("LaViconiaState","LOCALS",0)
    ApplySpellRES("LaVNig",Myself)
    SetInterrupt(TRUE)
END

If you want to risk, give it a try, you may use DLTCEP or NearInfinity to remove those two blocks from all her scripts. I never tried it myself, but that's the only thing that comes to mind. Alternatively, you may open both spells mentioned in ApplySpellRES and remove all the effects.