I actually have a couple of healing potions, and I can probably use a healing wand without rolling UMD, right?
Yeah, Verossa's in the same situation. To use a wand for a spell that's not on your list, you need Spellcraft, which every caster has. If not you use UMD, which not a lot of classes have.
EDIT: Ommited the word "not", thus making my entire statement meaningless.