I read an interesting theory about Blaze. Back when Skye (Chandler-Quartermaine) was in town, Luke nicknamed her "Blaze" because of her red hair. Skye had a baby with Lorenzo Alcazar that she named Lila Rae Alcazar. There is speculation that Blaze might actually be Lila Rae. It does seem odd that they would reuse the name without some kind of connection. Or, perhaps the writers were just looking for an interesting name and didn't consider that it had already been used.
On another note, the adorable little girl who plays Donna is a fantastic actress! She's only 6, yet she seems to have a good grasp of how to portray her character's emotions and, even more importantly, how to relate to the adults around her. Contrasting her to the little boy who plays Wiley, he's cute. He delivers his lines. But he comes across as a bit of a robot. That's not uncommon for actors his age. It's quite impressive to see such a young actress who really seems to get what acting is all about. I feel like that's why she's getting so much screen time lately.