Well, now that's a fucking twist...
As sad as it is that Lacrima is a puppet made by Helem; that Helem is going to use her like a tracking beacon to find Diana; and that at any point she could possibly just end the spell and destroy the Lacrima we've come to love, we can see from all this that Lacrima is a person who thinks and feels all their own. And who knows, maybe the same will happen with Altus...