Since we seem to get to see a rejuvenated Hunter, we can be quite sure, that Annabelle also got rejunevated and is the real, original Annabelle, can't we?
Has it actually been confirmed that young Hunter is a rejuvinated Hunter, and not a clone?
Annabelle didn't behave like a rejuvinated mother to Ophelia when meeting her, let alone refer to Hunter as her husband. She didn't even seem aware that Ophelia was her own flesh & blood.
The only way for her to be
The Annabelle, is for her to be totally in on Hunter's schemes, which would be a pretty shitty double-twist to have happen this close to the end... Like, right at the end. I mean, it'd be like any of M. Knight Shyamalan's worst "what a twist" moments.