Yes, I love grown up Shuri. What she told Bast was right on target. She left the Prime Earth Wakandans for what she thought were greener pastures, and we see how that turned out for her. But Shuri was smart not to close the door to receiving Bast's help either. She just knew better than to base their war plan around Bast.
As for N'Jadaka's knowledge of Ororo, Coates wrote an issue that showed the Wakandans of his time knew of the Hadari Yao. The issue was more geared toward seeing that knowledge in panel scenes with Nakia but I guess the leap could be that, because Ororo was associated with Prime Earth's BP, that those other Wakandans knew about her as well. There was also some prophecy about a T'Challa coming and rescuing them and that he would have prophetic dreams. Those dreams, in reality, were the few recurring memories a brain-wiped T'Challa managed to keep of Ororo, although he had no context to his visions.
I really wish Coates did more with this part. Or maybe he doesn't have to. I think T'Challa's "visions" of Ororo has been overshadowed by other stuff, like her "confrontation" with Nakia. What Coates did that was so powerful and utterly pro Ororo and T'Challa, was having T'Challa lose every bit of his memories except for one or two linked to Ororo. He dreamt of her and their last night together for the entirety of his time away. He had no more information to go on other than her face and her words for him to come back to her. But, I think, especially in the beginning, that's what drove him. After Bast restored his memory, that drive to return home kicked in with a strong force. He wasn't just fighting against N'Jadaka but he was fighting to get back to his loved ones.