From the way you describe the rest of the party I'd say they need a tank/protector.
Str 18, Dex 14, Con 17, Int 10, Wis 12, Cha 8
Feats: Power Attack, Improved Buckler Defense (Complete Warrior), EWP: Spiked Chain (Ftr), Improved Unarmed Strike (Mnk), Improved Grapple (Mnk), Combat Reflexes (Mnk), Hold the Line (Complete Warrior).
Wear heavy armor. (You heard me...
) You may want a mithral breastplate later in order to use evasion. (If your NPC gets her own share of the loot to buy new gear.) This is a "defender" - don't charge ahead and steal all the glory, protect the weaker party members instead. Both Improved Trip and Improved Disarm are good options for level 6 monk. (If you can get both that's good, but the Int is too low for Expertise.) The spiked chain is not a must-have. You can perform pretty much the same function with a guisarme (or a ranseur, for disarms).
I'd also consider a skirmisher type with spring attack (low AC, focused on staying away from danger) but the party has plenty of light combatants already.
Do not make a monk with 12 Con. Even 14 Con is questionable. She will be hit, and she will need every HP she can get to survive. Trust me on this.
Str 18, Dex 14, Con 17, Int 10, Wis 12, Cha 8
Feats: Power Attack, Improved Buckler Defense (Complete Warrior), EWP: Spiked Chain (Ftr), Improved Unarmed Strike (Mnk), Improved Grapple (Mnk), Combat Reflexes (Mnk), Hold the Line (Complete Warrior).
Wear heavy armor. (You heard me...

I'd also consider a skirmisher type with spring attack (low AC, focused on staying away from danger) but the party has plenty of light combatants already.
Do not make a monk with 12 Con. Even 14 Con is questionable. She will be hit, and she will need every HP she can get to survive. Trust me on this.
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