I disagree. It is true that Vaarsuvius can't cast those spells because they're too high level. But I think she does have those spells in her spellbook, and could have let Zz'drti copy them.
The rules allow a wizard to copy any wizard spell to her spellbook, even if it's too high level for her to cast. Writing a spell requires making a Spellcraft checks to learn that spell, which is more difficult for higher level spells, but it's not something Vaarsuvius couldn't clear even for a level 9 spell. Vaarsuvius has spent decades studying arcane magic, so it's entirely possible that she's added spells like Time Stop, Meteor Swarm, and Wish to her spellbooks, hoping that one day she will have enough arcane power be able to cast them. (Vaarsuvius probably shouldn't have Vampiric Touch in her spellbook though, because that spell is of the Necromancy school which is one of Vaarsuvius's barred schools, and she can't copy such spells. Perhaps she doesn't: she might have a scroll from a randomized booster pack, and offers Zz'dtri to learn the spell from that scroll.) Of course, Zz'dtri couldn't cast those spells either, and she might already have them in her spellbook too, so they may be worthless to her.