Yep, the Druid can heal herself using this move. There is no concern about balance (there almost never is in Dungeon World, because of the 6− possibility can always scale up what is risked to match the magnitude of the advantage sought), and it's certainly flavourful for the Druid to ask the spirits to help her.

I haven't seen official word on *this* move, but Sage has weighed in on an even odder wording in a way consistent with your and my reading of this move. The Wizard's *invisibility* spell says that it targets an "ally", leading groups to assume that the Wizard can't make himself invisible, but Sage's answer was that the Wizard is his own ally and can use the spell on himself.

So if that reading is permissible, this one *definitely* is if we apply Sage's reasoning—the Druid is most definitely "someone."