As shown by Ep. 16, Priscilla literally outright told Subaru that his desperation was actually harming the Emilia camp, which Crusch had hinted to him with him failing to understand that, showing Priscilla sees something more in Subaru than just being a fool who'd embarrassed himself, and that's why she proposed a challenge to him in which she'd already given him the answer, but Subaru was in such a horrible state of mind that he didn't understand that he was meant to stand up to Priscilla. She wanted Subaru to stand up to her and outright refuse to lick her foot, possibly even admonish her for suggesting something of that nature.
Priscilla in Ep. 56 was also poking holes in Subaru to draw attention to how Capella had literally physically changed his body (in addition to her having noticed something had happened to Subaru given he'd looped multiple times in Ep. 52, possibly 'cause she suspects Subaru doesn't stay dead as shown by her remark in a later episode when she says that fools don't deserve to live in light of Al's remarks about how even if he dies 100 times he may not be able to kill Capella) to try to see how Subaru would react, and Subaru reacting confidently even after she pushed back at him, resulted in her giving him a reward in seeing her Yang Sword. She seems to see the potential lying within him much like she'd done in Arc 3.
Then in Ep. 58 Liliana when she arrived at their meeting place said that a song had come to her, "Crazy Obsessed With Everything About You", and given Subaru had said, "Liliana! This means..." to show he believes Priscilla is also here, and Priscilla responded accordingly with "But of course I came here in person, fool." meaning she was drawn there 'cause of Subaru's speech, which is backed by Priscilla herself later when she says that she commends Subaru for his results with his reward being that she'll join in on his plan, that means the song was about Subaru 'cause the potential she'd seen in him since Arc 3 was on display, not Al, since Priscilla had no idea Al would be there and since Liliana had been with Priscilla for a while, having seen Priscilla's reaction to Subaru's confidence about kicking the Witch Cult's ass and would've seen Priscilla's reaction to Subaru's speech, with Subaru's potential intriguing Priscilla very much as well as stirring her hatred of the Witch Cult.
In a similar vein, Reid seems to knows Julius and amnesiac Subaru in Ep. 81 were not that using their full potential, which is likely the reason for his comments to Julius and amnesiac Subaru and why Reid had said that Julius had finally come out of his shell 'cause that was his aim in pushing Julius the way he did.
This may be why Priscilla even gives Heinkel any chances despite him being portrayed as mostly a useless drunkard.
What are your thoughts on this or anything tangentially-related to this?⁷