That's... very weird. o.o She doesn't look like any stripe I've ever seen--look at those sides! On the other hand, she has a clean, but not white, belly and the stripe is not contiguous, so I doubt it could be a tessera.... Terrazzo would be almost pattern-less, unlike this stunning critter! *shrug* It looks like it could almost be a motley stripe, but that would only be possible if the mom was het for stripe.
I think I'll give the personal opinion that it's a particularly exemplary little motley stripe, but I'd want to test breed the mom to be sure (and I'm not going to pretend I'm an expert).

Either way, sure is a gorgeous little snakey! ^_^
EDIT: Looking at the picture again, I still don't think it could be tessera since the stripe is broken so many times and the belly is clear but not white; however, the fact that the stripe
does continue all the way to the tip of the tail and does not appear to break at the girdle (the spot directly opposite the vent).... That
is a tessera trait. If the female has ever been bred to a tessera, it might be possible. I think you should test breed this snake as soon as is safely possible. XD