Baldur's Gate : The Sword Coast Chronicles : NWN2 Persistent World

I have, in the works, a sorcerer/ASoC/Frost Mage/Pale Master. Right now, she's a decent caster, but I'm always looking to make her better. The main thing I'm stuck on, however, is spell selection.

I was thinking of taking the reserve feat Glacial Wrath. I know it'll be a bit tough to position with it, but I'm confident I can do it. Just want the community's thoughts.

Current spells:
0: Acid Splash, Daze, Light, Mark Rune, Ray of Frost, Resistance
1: Lesser Orb of Cold, Magic Missile, Protection from Alignment, Ray of Enfeeblement, Shield
2: Blindsight, Frst Breath, Ice Darts, Mirror Image
3: Displacement, Improved Mage Armor, Vampiric Touch
4: Ice Storm, Orb of Cold
5: Lesser Spell Mantle

Any 'Must-haves' that I missed? Any that I shouldn't even consider? She is Sorc 6/AS 3/Frost 1 ATM.

Level 3:
Greater Magic Weapon, party/summon spell.

Level 4:
Dimension Door, it can help you get past things.
Assay Resistance, it can help you over come spell resistance.
Wall of Ice, it kind of matches the theme but might be entirely useless.
Stone Skin, a party/summon buff.

Level 5:
Cone of Cold, a cold damage spell.
Glass Doppelganger, you could try to wing it as an 'Ice' Doppelganger.
Programmed Image, might be able to take hits from your Piercing Cold damage...
Cloudkill, a way to lower constitution scores of enemies...

Level 6:
Superior Resistance, +6 saves
Greater Heroism, +6 saves
Ethereal Visage, 20/adamantine DR

Level 7:
Energy Immunity, gain some elemental damage immunities.
Avasculate, halve HP, evil spell too for your Palemaster to use.

Level 8:
Premonition, 30/adamantium DR.
Polar Ray, cold damage spell
Create Greater Undead, undead

Level 9:
Mord, dispel supreme

Thank you, oh Great and Handsome Monkey King.

If you pick Glass Doppelganger, you might just as well get the Shadow Simulcacrum (9) spell too.

Burst of Glacial Wrath is a level 9 cold spell, the problem is it doesn't kill things, it just freezes them at low health.

Yeah, I'll pick it up anyways. That way, I have a 9th level cold spell for the reserve feat.