It's a ghoul or a ghast, IMO. She's a mystic theurge, right? If her caster level is 11, it's a ghoul, if it's 12-14, it's a ghast.
Hmm, I just realized that in 3.5e, create undead can't actually make wights; in 3.0, it could, if you were 16th level. So either her wights were made by a grandfathered-in 3.0 version of the spell, or she did it with enervation (since things killed by negative levels come back as a wight, unless otherwise specified).