Don't get your hopes up, no Momentum here.
She sells the following :
Dalaran Initiates' Pin, places over your head the old Dalaran Brilliance effect (the alternative SP buff she used to sell a book for) for 5 minutes with a 10 min cooldown
Mystical Tome: Arcane Linguist : Teaches Arcane Linguist (passive).
Mystical Tome: Illusion : Teaches Illusion ability.
Familiar Stone : Conjures a familiar stone
Dalaran Initiates' Pin is sold in limited quantities, with apparently a 30 min respawn timer.
These vendors are available for all classes, more information here : https://www.reddit.com/r/wow/comment...orld_who_sell/
EDIT : Mages can now buy all items