while i agree about her relevancy shes not an ‘alliance high elf’ shes a dalaran elf. she never appears outside of the context of the kirin tor. she simply works in an inn that only serves humans and other alliance races IN dalaran
and really if you insist on counting her as an ‘alliance high elf’ then i guess all the other dalaran elves that perform services for the horde in dalaran are horde ‘high’ elves
dalaran is a neutral kingdom along with the kirin tor(which the SC are a part of). it is not part of the alliance. just to drive home the point, every horde mage starts out as friendly with the kirin tor