Considering that she's the older sister of Vereesa, and the fact that she's higher rank than Auric. She is also more renowned and more experienced than Jalinde. I think it's possible that at least somewhere behind the scenes, she also took leadership and rallied the remaining Alliance loyalist High Elves.
I mean there's even more new High Elf NPCs like that portal NPC in Boralus, that one expedition NPC, and the 7th Legion Battlemages who help face off against their Blood Elf kin in Stromgarde. They don't seem to act under Vereesa's behalf given that she is pretty much absent in 99.9% of BFA.
Or does she cater only for the Void elves still?