I have no say in what the gf does. If I withhold money she just borrows it or spends what she has and then tells me the granddaughter has nothing to eat!
I have tried to stay away from the birds to show my disapproval but a previous parakeet bit off all its tail feathers out of frustration, a small cage and lack of attention. I got a big cage and toys for it but by then it was biting everyone, hard, and died soon after. Then again after i said "no more" they bought a ring-necked parakeet which wasn't affectionate or active (as is normal for the species), rarely uttered any sound, became afraid of humans and then died. The gf just does not get that a bird is not a toy to pull out of the box when the kid has free time. They need a LOT of attention and proper care. Anyway, I told her the ghosts of all these dead birds will come back to haunt her...