Woohoo! Somebody with an AfRock! Welcome to our little corner of the web!
As far as the raised discolored scale, it could possibly be a healing nose rub wound. I have never heard of any outward visible signs of an RI like that, so I doubt it's a sign of an RI. If it doesn't seem to be affecting her sheds or appetite, I probably wouldn't worry about it, unless it gets bigger. If you've got the $$ for a pre-emptive veterinary strike, you could get it looked at.
I, personally, am looking forward to some more pics of Neph in particular. Is Neph your first giant constrictor species?
Glad to have you aboard!