Part of that though is because she is high enough at Universal to have that power. She's a Performance Coordinator for HHN when she's not Chance so her job is literally to make sure people stay within IP restrictions or whatever restrictions are in place for originals. They probably consider their Icons as IPs so they allowed her to be in on the selection process for who carried the best qualities of Chance, as she would know.The culture at Universal also isn’t one that “recast” notable roles. The guy who played Jack at 25 was the same guy who played Jack at 10. The woman who created Chance for 17, and played her at 25 and in media for 26 handpicked the women who played her character in the streets. Universal is extremely loyal to its performers. They won’t just recast HR.
Technically, that was a recasting. The same process could be done for HR. Bring back the original for auditions and ask who carries the best qualities of the character. It would be a short term hire. I'm not suggesting that this is going to happen nor do I really care if it does, but i'm saying it's not out of the realm of possibility.